Blog · 2026-04-01 · manager

Business Advisory Services Companies in London: Practical Guide

Choosing a business advisory firm in London is rarely just about getting outside advice – it often shapes how decisions are made, how risks are handled, and how a business moves forward over time.

London brings together a wide mix of advisory firms, from large, multi-service consultancies to smaller teams focused on specific areas like growth strategy, restructuring, or financial planning. Each tends to approach problems a bit differently, depending on their background and the kinds of clients they usually work with.

This guide looks at a selection of business advisory services companies operating in London. It is not a ranking. The idea is simply to give a clearer picture of who these firms are, where they tend to focus, and the type of support they offer in practice.

Acumon

Acumon is a London-founded firm of chartered accountants, auditors and advisors. They work with clients across the UK and internationally. The firm operates as a full-service practice. Their work brings together accounting, tax and business advisory. It also includes audit and risk-related services. Based in West London, they support organisations with more structured financial and regulatory requirements. Especially where oversight and control matter on an ongoing basis.

Business advisory here is closely tied to governance and regulatory oversight. It is not treated as a separate layer. It sits within a broader risk and technology assurance offering. The firm works with finance teams, directors and boards. They review how processes actually function day to day. Not just whether controls exist, but whether they are consistent and reliable.

A lot of the work focuses on identifying gaps, improving reporting, and strengthening control frameworks. There is also a clear link to compliance with UK requirements. Advisory support often connects financial decision-making with systems, risk exposure and internal accountability. The aim is to keep operations aligned, without making processes overly complex.

Key Highlights:

London-based firm working with international clients and group structures
Registered audit practice focused on governance and oversight
Business advisory linked to risk, compliance and controls
Team includes professionals with HMRC and regulatory experience
Integrated accounting, audit, tax and advisory services

Services:

Business advisory
Risk and compliance advisory
Governance and control reviews
Financial planning and analysis
Reporting and process improvement
Regulatory alignment support

Contact information:

Website: acumon.com
Phone: 020 8567 3451
E-mail: mail@acumon.com
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK

Gerald Edelman

Gerald Edelman is a London-based advisory and accountancy firm working with businesses across different stages of growth. Their business advisory sits alongside compliance, tax and accounting work, which gives them a closer view of how companies actually operate. This tends to shape the way they approach advisory – less theoretical, more tied to real financial and operational conditions.

The firm works with business owners and directors on a range of strategic and day to day decisions. This includes growth planning, restructuring and broader management support. Advisory is often linked to governance and oversight, especially where businesses are evolving or facing change. In practice, this means helping leadership teams think through options, understand risks, and move forward with a clearer structure rather than just reacting to issues as they come up.

Key Highlights:

London-based firm working with owner-managed and growing businesses
Advisory linked to accounting, tax and compliance work
Supports businesses across different stages of development
Works closely with directors on strategy and decision-making
Covers financial, operational and management areas

Services:

Business growth planning
Corporate restructuring support
Strategic business advice
Financial decision support
Non-executive support

Contact information:

Website: www.geraldedelman.com
Phone: +44 (0)20 7299 1400
E-mail: hello@geraldedelman.com
Address: 73 Cornhill, London, EC3V 3QQ
LinkedIn: www.linkedin.com/company/geraldedelman
Instagram: www.instagram.com/geraldedelmanuk

Saffery

Saffery is an advisory and accountancy firm working with mid-market businesses, international groups and family-owned companies. Their business advisory services are part of a broader offering that includes tax, accounting and specialist support areas. The firm tends to be involved in planning and decision-making processes where financial, ownership or structural questions need to be worked through carefully.

Their advisory work often connects to valuation, succession and dispute-related matters. This includes supporting negotiations, preparing valuation reports and assisting in situations where independent financial input is needed. There is also a link to compliance and regulatory expectations, particularly when dealing with HMRC or formal reporting requirements. In practice, the work focuses on helping businesses make informed decisions in situations that are not always straightforward.

Key Highlights:

Advisory firm working with mid-market and international businesses
Experience with family-owned and privately held companies
Strong focus on valuations and ownership-related matters
Works on both commercial and dispute-driven cases
Advisory linked to tax, compliance and reporting

Services:

Share valuation services
Business succession planning
Forensic accounting support
HMRC negotiation support
Payroll advisory support

Contact information:

Website: www.saffery.com
Phone: +44 (0)20 7841 4000
E-mail: info@saffery.com
Address: 71 Queen Victoria Street, London EC4V 4BE, UK
LinkedIn: www.linkedin.com/company/saffery
Instagram: www.instagram.com/saffery_uk

Opus Business Advisory Group

Opus Business Advisory Group is a UK-based advisory firm with a network of offices, including London. Their work focuses on situations where businesses are dealing with change, pressure or transition. This can include financial distress, restructuring, or preparing for growth. Advisory is delivered through several connected areas, including restructuring, strategic advisory and forensic accounting.

The firm works with businesses and stakeholders to assess options and decide on a workable path forward. A lot of their advisory is tied to risk, financial stability and compliance requirements, especially in more complex or time-sensitive situations. This includes restructuring debt, handling insolvency processes, or investigating financial issues. The approach is usually practical – laying out possible routes, highlighting risks, and helping management move through difficult decisions with more structure.

Key Highlights:

Advisory firm with offices across the UK including London
Focus on restructuring, turnaround and complex situations
Works with businesses, lenders and stakeholders
Combines strategic, financial and forensic expertise
Advisory linked to risk, stability and compliance

Services:

Corporate restructuring advisory
Insolvency process support
Debt restructuring advisory
Forensic accounting investigations
Strategic business advisory

Contact information:

Website: opusllp.com
Phone: +44 (0) 203 326 64540
E-mail: liverpoolenquiry@opusllp.com
Address: 322 High Holborn, London, WC1V 7PB, United Kingdom
Facebook: www.facebook.com/opusbusinessadvisorygroup
Twitter: x.com/opus_llp
LinkedIn: www.linkedin.com/company/opus-advisory-group-uk

Griffin Stone Moscrop & Co

Griffin Stone Moscrop & Co is a Central London accountancy firm providing business strategy consulting and advisory services alongside accounting and tax. Their advisory work is often positioned as a practical extension of financial reporting and governance. It tends to focus on helping businesses understand their financial position and use that as a basis for planning and decision-making.

The firm works with both early-stage and established businesses. Advisory support often includes reviewing internal processes such as budgeting, reporting and control systems. There is also a governance angle, especially where financial oversight and accountability need to be strengthened. In practice, the work is fairly hands-on. It can involve attending meetings, acting as a sounding board, and helping management teams structure decisions in a more consistent way.

Key Highlights:

Central London firm working with startups and growing businesses
Advisory linked to accounting, reporting and governance
Focus on financial control and operational oversight
Involved in decision support and management processes

Services:

Business strategy advisory
Management consultancy support
Financial process reviews
Budgeting and reporting support
Operational efficiency advice

Contact information:

Website: www.gsmaccountants.co.uk
Phone: 020 7935 3793
E-mail: mail@gsmaccountants.co.uk
Address: 21-27 Lamb’s Conduit Street, Holborn, London, WC1N 3GS
Facebook: www.facebook.com/gsmaccountants
Twitter: x.com/GSMAccountants
LinkedIn: www.linkedin.com/company/griffin-stone-moscrop
Instagram: www.instagram.com/gsmaccountants

Azets

Azets is a large advisory and accountancy firm with a presence across the UK and internationally. Their business advisory sits within a broader service offering that includes accounting, tax, audit and corporate finance. The firm works with businesses at different stages, from early growth to more established operations, often where structured planning and compliance become more important.

Their advisory work covers both strategic and operational areas. This includes planning, performance monitoring and support with major business decisions such as refinancing or sale. There is also a clear link to governance and compliance, particularly where businesses need to stay aligned with regulatory requirements while continuing to grow. In practice, advisory is often supported by digital tools and reporting systems, helping businesses track performance and make more informed decisions over time.

Key Highlights:

Advisory firm with UK and international presence
Works with SMEs and businesses at different growth stages
Business advisory linked to compliance, planning and governance
Combines advisory with accounting, tax and corporate finance
Uses digital tools to support reporting and decision-making

Services:

Strategic planning advisory
Business performance analysis
Compliance and governance support
Growth and scaling advice
Refinancing and exit support

Contact information:

Website: www.azets.com
Phone: +44 (0) 20 7403 1877
Address: 2nd Floor, Regis House, 45 King William Street, EC4R 9AN
LinkedIn: www.linkedin.com/company/azets
Instagram: www.instagram.com/azets_uk

Menzies

Menzies is a UK-based business advisory and accountancy firm with an international reach through its network connections. Their advisory work sits alongside audit, tax, and financial services, which gives a broader view of how businesses operate across financial, operational and strategic areas. The firm works with organisations at different stages, including those dealing with growth, transition or more complex structural changes.

Business advisory here is closely linked to strategic planning, transactions and operational improvement. It often connects with governance and oversight, especially where businesses are preparing for expansion, restructuring or exit. In practice, this means working with leadership teams to review direction, assess options and align decisions with financial and regulatory expectations. Advisory is not isolated, it tends to sit across multiple service lines, linking strategy with execution and control.

Key Highlights:

UK advisory firm with international network reach
Works with businesses across sectors and growth stages
Advisory linked to strategy, transactions and operations
Strong connection to governance and financial oversight
Integrated with audit, tax and financial services

Services:

Strategic business advisory
Transaction and deal support
Business restructuring advice
Valuation and exit planning
Operational improvement support

Contact information:

Website: www.menzies.co.uk
Phone: +44 (0)20 7387 5868
Address: 4th Floor, 95 Gresham Street, London, EC2V 7AB
LinkedIn: www.linkedin.com/company/menzies-llp
Instagram: www.instagram.com/menzies_llp

Henderson Royce

Henderson Royce is a London-based accountancy firm providing business advisory support alongside tax and financial services. Their advisory work is often used by small and growing businesses that need more structure around planning, financial management and decision-making. It tends to focus on building a clearer understanding of performance and identifying areas for improvement.

The firm’s advisory covers both strategic and operational aspects. This includes financial analysis, budgeting, risk management and process improvement. There is also a link to compliance and governance, particularly for businesses that are scaling or adjusting their structure. In practice, the work focuses on helping business owners make more informed decisions and manage growth with more control and stability.

Key Highlights:

London-based firm working with small and growing businesses
Advisory linked to financial planning and operational control
Focus on decision-making, risk and performance
Supports businesses at early and growth stages
Combines advisory with accounting and tax services

Services:

Strategic planning support
Financial analysis advisory
Budgeting and cash flow support
Risk and compliance advisory
Operational improvement support

Contact information:

Website: hraccountants.tax
Phone: 020 3746 7296
E-mail: info@hraccountants.tax
Address: Suite200, 750-760 High Rd Leytonstone, Bushwood, London E11 3AW, UK
Facebook: www.facebook.com/hraccountants

Spartan Accounting Group Ltd

Spartan Accounting Group Ltd is a London-based firm providing business advisory alongside accounting, tax and financial services. Their advisory work is often used by small and mid-sized businesses that need a clearer view of how the business is performing day to day. It tends to focus on practical areas like cash flow, operations and planning, rather than abstract strategy. The firm works across sectors such as property, construction and digital businesses, which shapes a more hands-on approach.

Their advisory is closely tied to oversight and risk awareness. A large part of the work involves reviewing how the business is structured, where issues sit, and how decisions are being made. This includes financial analysis, operational reviews and identifying gaps that could affect growth or stability. In practice, the focus is on helping business owners understand their position and move forward with more control, especially when dealing with growth, funding or internal changes.

Key Highlights:

London firm working with SMEs across multiple sectors
Advisory linked to financial performance and operational oversight
Focus on cash flow, planning and business structure
Supports growth, funding and internal decision-making
Connected to accounting, tax and compliance services

Services:

Business health check reviews
Financial performance analysis
Cash flow planning support
Risk and compliance advisory
Growth and restructuring advice

Contact information:

Website: spartanaccounting.co.uk
Phone: 0203 727 3277
Address: 71-75 Shelton Street, London, WC2H 9JQ
Facebook: www.facebook.com/spartanaccounting
Twitter: x.com/SpartanAccount
LinkedIn: www.linkedin.com/company/spartan-accounting-group-ltd

The Stan Lee

The Stan Lee is a London-based accountancy and advisory firm working with startups and small businesses at different stages of development. Their business advisory tends to focus on early decisions and ongoing management, especially for owners who are still shaping how their business operates. This includes support with setup, structure and basic planning, as well as more practical areas like finance and compliance.

Their advisory work is closely tied to day-to-day oversight. It often involves reviewing how the business is performing, identifying issues early and helping owners make clearer decisions around growth, funding or operations. There is also a link to governance, particularly around responsibilities, legal requirements and financial management. In practice, the focus stays quite hands-on, with guidance that connects directly to how the business is run.

Key Highlights:

London firm supporting startups and small business owners
Advisory linked to setup, planning and ongoing management
Focus on financial control and operational clarity
Supports funding, compliance and business development
Integrated with accounting and tax services

Services:

Startup advisory support
Business planning guidance
Funding and loan support
Financial management advice
Business health reviews

Contact information:

Website: www.thestanlee.com
Phone: 020 3778 0973
E-mail: info@thestanlee.com
Address: Level 18 | 40 Bank Street, Canary Wharf, London | E14 5NR
Facebook: www.facebook.com/TheStanLee
Twitter: x.com/TheStanLee
LinkedIn: www.linkedin.com/company/the-stan-lee
Instagram: www.instagram.com/stanleeaccountancy

Mouktaris & Co

Mouktaris & Co is a London-based advisory and accountancy firm working with businesses on strategy, growth and long-term planning. Their business advisory is often used by companies looking to define direction or deal with more complex decisions such as ownership changes, expansion or exit. The work tends to combine financial insight with a broader view of how the business is structured and managed.

Their advisory is closely connected to governance and risk awareness. This includes areas like corporate structure, shareholder arrangements and financial planning. It also covers forecasting, cash flow control and funding decisions. In practice, the firm often works alongside management teams, helping them assess options, structure decisions and maintain a clearer view of both risks and opportunities.

Key Highlights:

London firm supporting businesses from startup to exit stage
Advisory linked to strategy, governance and financial planning
Focus on growth, funding and ownership decisions
Works closely with management on planning and execution
Integrated with accounting, tax and compliance support

Services:

Strategic planning advisory
Cash flow forecasting support
Funding and finance advice
Corporate governance support
M&A and exit advisory

Contact information:

Website: www.mouktaris.co.uk
Phone: 020 8952 7717
E-mail: info@mouktaris.co.uk
Address: 156A Burnt Oak Broadway, Edgware, London, HA8 0AX
Twitter: x.com/mouktarisco
LinkedIn: www.linkedin.com/company/mouktaris-&-co

Kreston Reeves

Kreston Reeves is an advisory and accountancy firm with a presence in London and across the UK, supported by an international network. Their business advisory focuses on transformation and growth, often used by organisations dealing with change, operational pressure or shifting market conditions. The work tends to start with understanding the current position and identifying where improvements or adjustments are needed.

Their advisory is closely linked to governance, risk and long-term planning. This includes reviewing operations, improving efficiency and supporting decisions around restructuring or expansion. There is also a strong connection to compliance and resilience, especially where external pressures or regulatory requirements are involved. In practice, the focus is on helping organisations adapt, make structured decisions and maintain stability while moving forward.

Key Highlights:

Advisory firm with UK presence and international network access
Focus on transformation, growth and operational improvement
Advisory linked to governance, risk and compliance
Supports businesses facing change or market pressure
Combines advisory with accounting and corporate finance

Services:

Business transformation advisory
Operational efficiency support
Risk and compliance advisory
Restructuring and change support
Strategic growth planning

Contact information:

Website: www.krestonreeves.com
Phone: +44 (0)330 124 1399
Address: 2nd Floor, 168 Shoreditch High Street, London, E1 6RA
Twitter: x.com/KrestonReeves
LinkedIn: www.linkedin.com/company/kreston-reeves

Blick Rothenberg

Blick Rothenberg is a London-based advisory and accountancy firm working with businesses, entrepreneurs and private clients across a range of sectors. Their business advisory sits within a broader structure that includes tax, audit and transaction services, which shapes a more integrated approach. The work often connects financial planning with wider business decisions, especially where growth, investment or international activity is involved.

Their advisory is closely linked to governance and oversight. It often involves helping organisations understand risks, manage tax exposure and structure operations more effectively. There is also a strong connection to regulatory requirements, particularly for businesses operating across borders. In practice, the focus is on giving a clearer view of financial position and supporting decisions that have both operational and compliance impact.

Key Highlights:

London advisory firm working with businesses and private clients
Advisory linked to tax, transactions and financial planning
Strong focus on governance and regulatory oversight
Supports international and cross-border business activity
Integrated with audit, accounting and advisory services

Services:

Business advisory support
Tax and structuring advice
Transaction and deal support
International business advisory
Risk and compliance support

Contact information:

Website: www.blickrothenberg.com
Phone: +44 (0)20 7486 0111
Address: 16 Great Queen Street, Covent Garden, London, WC2B 5AH
Twitter: x.com/BlickRothenberg
LinkedIn: www.linkedin.com/company/blickrothenberg
Instagram: www.instagram.com/blickrothenberg

Teneo

Teneo is a global advisory firm with a strong presence in London, working with senior leadership teams on complex business challenges. Their business advisory covers a wide range of areas including strategy, financial advisory, risk and communications. The work is often used by larger organisations dealing with change, disruption or high-stakes decisions.

Their advisory is closely tied to governance, risk and strategic direction. This includes restructuring, transactions, political and regulatory risk, and broader transformation efforts. The firm often works at leadership level, helping organisations navigate uncertainty and align decisions across different functions. In practice, the approach brings together multiple advisory areas, linking strategy, risk and execution.

Key Highlights:

Global advisory firm with established London presence
Works with leadership teams on complex business issues
Advisory linked to strategy, risk and transformation
Strong focus on governance and regulatory environment
Combines financial, consulting and communications advisory

Services:

Strategic advisory support
Financial and restructuring advisory
Risk and governance advisory
M&A and transaction support
Business transformation advisory

Contact information:

Website: www.teneo.com
Phone: +44 20 7260 2700
Address: The Carter Building, 11 Pilgrim Street, London, EC4V 6RN
Twitter: x.com/Teneo
LinkedIn: www.linkedin.com/company/teneoglobal

Dragon Argent

Dragon Argent is a London-based advisory firm focused on founders, startups and small to mid-sized businesses. Their business advisory is built around supporting leadership teams where there are gaps in experience or structure. This often includes providing external perspective on strategy, governance and decision-making, without becoming a full internal function.

Their advisory connects closely to how businesses are run at a practical level. This includes planning growth, preparing for funding and managing ownership or exit decisions. There is also a clear governance element, particularly around board structure, accountability and risk. In practice, the firm works as an extension of the leadership team, helping founders make more structured decisions while keeping flexibility in place.

Key Highlights:

London advisory firm focused on founders and SMEs
Advisory linked to strategy, governance and leadership support
Works across growth, funding and exit stages
Provides external perspective to support decision-making
Supported by legal, tax and financial expertise

Services:

Growth strategy advisory
Corporate governance support
Fundraising strategy advice
M&A and exit advisory
Business planning support

Contact information:

Website: www.dragonargent.com
Phone: +44 (0) 20 7686 0000
E-mail: ask@dragonargent.com
Address: 63 Bermondsey Street, London SE1 3XF, Great Britain
Facebook: www.facebook.com/dragonargentltd
Twitter: x.com/DragonArgentLtd
LinkedIn: www.linkedin.com/company/dragon-argent-limited
Instagram: www.instagram.com/askdragonargent

Conclusion

Choosing a business advisory firm in London is rarely a quick decision. Most organisations come to it at a point where something needs to change – growth is picking up, risks are becoming harder to manage, or decisions simply carry more weight than before. At that stage, the focus usually shifts from basic support to something more structured. Not just advice, but a clearer way to think through financial, operational and governance questions.

What makes the process tricky is the range of firms available. Some lean more into day-to-day financial oversight. Others focus on transactions, restructuring or regulatory complexity. On paper, many services look similar, but in practice the difference often comes down to how closely the advisory work connects to real decision-making and how well it fits the organisation’s current situation.

That is where a guide like this becomes useful. It helps narrow things down. Not by ranking firms, but by showing how they actually work, who they tend to support, and where their strengths sit. For many organisations, that context is what makes the difference. It allows them to move past generic service lists and choose a firm that aligns with their structure, their risks and the kind of decisions they need to make next.