CASS 7 Audit Companies in London: Guide to Providers
AC
Acumon Chartered Accountants·15 min read
Choosing a CASS 7 audit provider in London is more than a regulatory exercise - it can affect how confidently a firm protects client money, maintains clear records and responds to FCA expectations.
London is home to a wide range of CASS audit and assurance providers, from large professional services networks to specialist accountancy and advisory firms. Each brings a different mix of audit experience, regulatory knowledge, sector focus and practical understanding of client money controls.
This guide highlights a selection of CASS 7 audit companies operating in London. Rather than ranking providers, the aim is to give practical context - outlining who these firms are, the types of regulated businesses they typically support, and the areas of client money compliance where they are most active.
Acumon
Acumon is a UK firm of chartered accountants and registered auditors providing CASS 7 audit services to FCA-regulated investment firms in London and across the UK.
The firm works with organisations that hold or control client assets, including investment management firms and other regulated entities subject to the FCA’s Client Assets Sourcebook (CASS). CASS 7 audits are delivered in accordance with relevant FCA Handbook requirements (including Section 7.10) and supported by a structured risk-based audit methodology focused on safeguarding client assets.
Acumon is an ICAEW-registered audit firm with the regulatory standing and expertise required to undertake CASS audits for FCA-regulated businesses. These specialist regulatory audits are subject to stringent FCA expectations regarding segregation, reconciliations, record-keeping and controls.
In addition to its UK audit registration, Acumon’s experience with regulated entities and international structures supports firms with cross-jurisdictional elements where relevant to CASS compliance.
CASS 7 audits focus on firms providing custody services or holding client assets such as stocks, bonds and other investments. Coordinating this work requires familiarity with FCA rules on asset segregation, identification, reconciliations and custody arrangements to protect client assets in the event of firm failure.
Acumon works with finance teams, CASS oversight functions and senior management to support CASS 7 audit requirements while also helping organisations strengthen controls, governance arrangements and processes around client asset protection.
CASS 7 Audit Capabilities:
Acumon provides CASS 7 audit services across a range of regulated organisational structures and sectors.
These include:
FCA-regulated investment firms
Firms holding or providing custody for client assets
Investment management and related entities
Organisations subject to CASS 7 requirements within broader group structures
These registrations allow the firm to provide CASS 7 audit services to groups that include entities in both the UK and key international financial centres.
Regulatory Licences and Registrations:
Acumon holds several audit registrations that enable it to support organisations operating across multiple jurisdictions.
These include:
UK statutory audit registration
Public Interest Entity (PIE) audit licence
Jersey audit licence
Isle of Man audit licence
Cayman Islands audit licence
British Virgin Islands audit licence
These registrations allow the firm to provide audit services to groups that include entities in both the UK and key international financial centres.
Core Services:
In addition to statutory external audit, Acumon provides a range of services that support financial reporting and governance.
These include:
Statutory external audit
Group and subsidiary audits
Public Interest Entity (PIE) audits
Charity and not-for-profit audit
Audit of international group structures
Internal audit and governance reviews
Risk management and compliance support
Audit work is often delivered alongside discussions with management and boards regarding financial reporting processes and governance frameworks.
Many organisations initially encounter statutory audit requirements as they grow and exceed the audit exemption thresholds set out in the Companies Act.
Acumon works with businesses that are:
Approaching their first statutory audit
Preparing for external investment
Expanding into international markets
Operating within corporate group structures
Early engagement with an audit firm can help ensure that financial reporting systems and documentation are aligned with statutory audit requirements.
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
BKL
BKL is a London-based accountancy and audit firm that provides CASS audit support for financial services businesses that hold or control client money. Their work covers several areas of the FCA Client Assets Sourcebook, including CASS 7 for client money, as well as CASS 5, CASS 6 and CASS 8. For firms dealing with client assets, this makes BKL relevant where the audit needs to sit alongside wider regulatory and assurance work.
BKL also looks at systems and controls as part of the CASS audit process. The firm can carry out CASS audits alongside statutory audits, which may help reduce repeated work where both are needed. Another point worth noting is their preparation for CASS 15, which will extend safeguarding audit requirements for e-money institutions from May 2026. BKL works with FCA-regulated businesses and also cooperates with regulatory advisers and solicitors who focus on financial services and CASS rules.
Key Highlights:
Works with FCA-regulated businesses
Covers CASS 7 audits for client money
Also covers CASS 5, CASS 6 and CASS 8
Supports preparation for CASS 15 safeguarding audit requirements
Works with financial services regulatory advisers and solicitors
Address: First floor, 5 Fleet Place, London EC4M 7RD
Phone: +44 (0)20 7832 0444
Menzies
Menzies is an accounting and financial management firm that provides CASS assurance and statutory audit services to clients across London and the South East. Their CASS 7 work is closely linked to client money reconciliations, especially for designated investment firms that need to check client money requirements against client money resources.
A strong part of Menzies’ CASS 7 work is its focus on the daily internal client money reconciliation process. They explain the normal and alternative approaches, the client money requirement, the client money resource and external reconciliations with third parties such as banks. Their work is relevant for firms that need audit support but also need a clear understanding of how their reconciliation process should be documented, checked and retained.
Key Highlights:
Provides CASS assurance and statutory audit services
Works with clients across London and the South East
Focuses on CASS 7 client money requirements for designated investment firms
Covers internal and external client money reconciliation processes
Explains normal, alternative and non-standard reconciliation methods
Services:
CASS assurance
Statutory audit
CASS 7 client money support
Review of client money reconciliations
Support with internal client money calculations
Support with external client money reconciliations
Address: The Colmore Building 20 Colmore Circus Queensway Birmingham B4 6AT
Phone: +44 (0)333 091 0411
MAH Chartered Accountants
MAH Chartered Accountants is a London City-based firm with experience working with financial services firms under the FCA framework. Their CASS audit work focuses on CASS 5 and CASS 7, with support for firms that hold client money and firms that do not hold client money but still need limited assurance work.
MAH Chartered Accountants sets out a fairly practical CASS audit process. They begin by understanding the firm’s business, licence, reporting needs, systems and controls. From there, they test transactions, review daily client money reconciliations, check supporting documents and agree any issues or breaches before submitting the report through FCA Connect. Their client base includes firms involved in foreign exchange trading platforms, CFD and options trading, insurance broking, wealth management, hedge funds, introducers and corporate finance.
Key Highlights:
Works with financial services firms
Covers CASS 5 and CASS 7 requirements
Performs reasonable assurance audits for firms holding client money
Performs limited assurance reviews for firms that do not hold client money
Price Bailey is a chartered accountancy firm with CASS audit work sitting within its wider audit and assurance services. Price Bailey works with FCA-regulated firms that hold client money or custody assets, including investment businesses, insurance-related firms, crowdfunding firms and FX trading businesses. Their CASS work covers different report types, depending on the firm’s permissions and whether client money, custody assets or both are involved.
Price Bailey pays close attention to the control environment behind CASS compliance. Their process can include reviewing how client money is held, checking acknowledgement letters, testing deposits and withdrawals, and looking at internal and external reconciliations. They also focus on breach identification, with schedules that set out the relevant CASS rule, the issue found and the firm’s response.
Key Highlights:
Chartered accountancy firm with audit and assurance services
Works with FCA-regulated firms that hold client money or custody assets
Hillier Hopkins is a chartered accountancy and tax advisory firm with offices in London, Watford and Milton Keynes. Hillier Hopkins supports firms that need CASS assurance reports, including designated investment firms that fall under CASS 7 for client money and CASS 6 for custody assets. Their work also covers cases where a firm may still need a CASS report even if it does not hold client assets.
Hillier Hopkins separates the reporting requirements by firm type, which is useful for regulated businesses trying to understand what they need before the deadline. They work with reasonable assurance, limited assurance and hybrid assurance reports, depending on the permissions and activities of the firm. Their CASS coverage also includes EMI and PSD firms preparing for CASS 15 safeguarding requirements, as well as mortgage and general insurance firms that may fall under CASS 5.
Key Highlights:
Chartered accountancy and tax advisory firm
Supports designated investment firms with CASS 7 and CASS 6 reporting
Covers reasonable, limited and hybrid assurance reports
Works with firms that may need a CASS report even without holding client assets
Also covers CASS 5 reporting for mortgage and general insurance firms
Wisteria is a North West London accountancy firm that provides CASS and client money audit services for businesses regulated by the FCA. Their work is built around the responsibility that regulated businesses have when they hold money on behalf of clients. Wisteria focuses on checking how client money is handled, whether controls are in place and whether the firm’s processes reduce the risk of errors, gaps or misuse of funds.
Wisteria’s CASS audit process looks at the client money-handling process in detail. They assess controls, identify possible issues and provide recommendations where the process needs improvement. Their approach is not limited to finding problems after the fact. Wisteria also works with clients to understand their procedures and shape the audit around the way the business actually handles client funds.
Key Highlights:
Provides CASS and client money audit services
Works with FCA-regulated businesses handling client money
Reviews controls used to safeguard client funds
Looks for issues in client money-handling processes
Tailors audit work around each business’s procedures
Address: The Grange Barn, Pike's End, Pinner, London, HA5 2EX
Phone: 020 4546 7630
Gravita
Gravita works with financial services firms that need audit and assurance support around client assets and client money. Gravita’s CASS audit work covers firms that hold client money, custody assets or insurance-related client money, so its scope can include CASS 5, CASS 6 and CASS 7 depending on how the firm is regulated.
Gravita places CASS audits within a wider control and governance context. The areas they focus on include segregation of client assets, record-keeping, reconciliations, internal controls and reporting obligations.
Key Highlights:
Covers CASS 7 client money audits
Also covers CASS 5 and CASS 6 where relevant
Reviews segregation of client money and assets
Looks at record-keeping and reconciliation processes
Services:
CASS 6 custody asset audits
CASS 5 client money audits for insurance-related firms
Johnston Carmichael provides CASS and safeguarding audit services for financial services firms with client asset obligations. Johnston Carmichael works with both new and established regulated firms, including businesses that are growing, changing their model or dealing with more complex CASS responsibilities. Their approach is shaped around the firm’s business model, governance framework, systems and operational controls.
Johnston Carmichael has a dedicated CASS audit team and also brings in IT audit support where systems and applications are important to CASS compliance. This is a relevant point for firms where client money processes depend heavily on technology, reconciliations and system controls. Their work can include reasonable assurance and limited assurance engagements, as well as management letter points with recommendations for improving procedures and controls.
Key Highlights:
Provides CASS and safeguarding audit services
Works with financial services firms at different stages of growth
Has a dedicated CASS audit team
Includes IT audit input where systems affect CASS compliance
Covers governance, controls and assurance processes
Provides management letter points where issues are found
PKF Littlejohn works with financial services firms that need audit and assurance support under CASS 6 and CASS 7. PKF Littlejohn’s CASS work is connected to its funds and asset management team, which covers firms such as asset managers, wealth managers, private equity firms, broker-dealers, listed and unlisted funds, and investment companies.
PKF Littlejohn places strong focus on audit preparation and the records firms should have ready before the year end. Their CASS-related work can involve reviewing risk and controls matrices, resolution packs, policies, procedures, breach registers and staff training records.
Key Highlights:
Works with CASS 6 and CASS 7 requirements
Supports firms in funds and asset management
Covers asset managers, wealth managers, broker-dealers and investment companies
Millet Audit is a firm of chartered accountants and registered auditors that works with FCA-regulated firms on CASS assurance. Millet Audit reviews how firms handle client money and assets, with attention to procedures, internal controls and reconciliation processes.
Their CASS work is built around understanding how the business operates before testing the client money process. Millet Audit can review current controls, prepare assurance reports where required and identify areas that may need improvement under FCA rules.
Key Highlights:
London-based chartered accountants and registered auditors
Works with FCA-regulated firms handling client money or assets
Reviews client asset procedures, internal controls and reconciliations
Provides CASS assurance reports where required
Can connect CASS assurance with statutory audit work
Lighthouse Consultants is a London-based firm that works with client money account audits and wider assurance over governance, risk management and internal control. Lighthouse Consultants focuses on CASS client money account audit work for financial institutions that need to assess how they follow the FCA’s Client Assets Sourcebook rules.
Their audit work looks at the main parts of client money protection, including segregation, record-keeping, reconciliations and client money distribution rules. Lighthouse Consultants also connects this work with internal audit standards and recognised assurance frameworks, which may suit firms that want CASS-related work to sit within a broader control review rather than stand alone as a narrow compliance exercise.
Key Highlights:
Works with CASS client money account audits
Reviews compliance with FCA client money rules
Looks at segregation and protection of client funds
Covers policies, procedures and records
Connects audit work with governance, risk and internal control
Address: Fitzrovia, 60 Tottenham Court Road, London, W1T 2EW
Phone: +44 2078710485
Warrener Stewart
Warrener Stewart is an accountancy and audit firm. Warrener Stewart prepares client money and client asset reports for regulated businesses that need annual reporting for a supervisory body. Their work covers a wider client money reporting area, including FCA-related reporting as well as reports for professional and property-sector bodies.
Unlike firms that focus only on FCA-regulated investment businesses, Warrener Stewart’s client money and asset reporting covers several types of organisations. They work with limited companies, LLPs, sole traders, partnerships, professional bodies, multi-site groups, UK subsidiaries of European organisations and charities.
Key Highlights:
Prepares client money and client asset reports
Covers FCA-related reporting and other supervisory bodies
Works with regulated businesses across different sectors
Choosing a CASS 7 audit provider usually comes down to fit, not size alone. A regulated firm needs an auditor that understands its permissions, client money model, reconciliation process, systems, controls and reporting deadline. The right provider should also be able to explain what type of assurance report is needed, where the main risks may sit and what evidence the firm should have ready before the audit begins.
For many firms, sector experience matters as much as audit experience. A business handling client money through trading platforms, investment activity, insurance distribution or other regulated services may need a different level of support from a firm with a simpler structure. It is also worth looking at how each provider approaches breach reporting, control testing, CASS mapping, acknowledgement letters, resolution packs and internal or external reconciliations.
This guide is intended to give a practical overview of CASS 7 audit companies operating in London. It is not a ranking. The aim is to help regulated firms understand the types of providers available, compare their areas of focus and start a more informed conversation before choosing an audit partner.
AC
Written by the Acumon team
Acumon is an ICAEW-registered firm of chartered accountants and registered auditors
based in London, with offices in Pitstone, Aylesbury and Bournemouth. Need advice on
anything covered here? Talk to us.
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