Old Mill

What Old Mill does

Old Mill is a privately held, partner-led accountancy and financial advisory firm headquartered in Yeovil, Somerset, with roots in the South West of England dating back to the 1920s. The group operates through multiple wholly-owned subsidiaries under the Kinbrook Group Limited holding company, including Old Mill Accountancy Limited, Old Mill Audit Limited, Old Mill Financial Planning Limited (FCA-authorised, registration 967142), Old Mill Jackson Limited, Old Mill Trust Corporation Limited, and Brook Financial Management Limited. It employs 250+ staff across five offices in Yeovil, Wells, Chippenham, Exeter, and Ilminster, serving over 5,000 clients through sector-specialist teams in Owner-Managed Businesses, Rural/Farming, Food & Drink, Wealth Management, and Property & Construction.

The firm's service offering spans audit and assurance, corporate and personal tax (including capital gains tax, inheritance tax, VAT, R&D tax relief, and tax investigations), financial planning and wealth management (pensions, investment management, later life planning, cash flow modelling), corporate finance (M&A advisory, MBOs, exit and succession planning), payroll and auto-enrolment, trusts, forensic accounting, and specialist SDLT advisory. Technology infrastructure is built on third-party cloud platforms — Xero (Platinum Partner), Silverfin (working papers and compliance), and Curo (financial planning back office) — rather than proprietary systems. Old Mill is ICAEW-regulated for accountancy and audit work and FCA-authorised for financial planning, enabling cross-selling of regulated and non-regulated services within a single client relationship.

The business model is professional services fees billed annually or per engagement, with recurring revenue from compliance work (payroll, auto-enrolment, tax compliance, bookkeeping via Brook Financial) and wealth management, supplemented by episodic advisory income (M&A, R&D tax, succession, SDLT). Client acquisition is primarily referral and relationship-driven across the South West, supported by content marketing, sector events, and Xero channel partnerships. The firm shows no external institutional ownership, no public listing, and no disclosed revenue, with growth funded organically through partner capital and reinvestment.

Name

Old Mill

Legal name

Old Mill Accountancy Limited

Website

https://om.uk

Company type

Private

Founded year

1920

Operating status

Operating

Headcount range

251–500 employees

Short description

Old Mill is a privately held, partner-led accountancy and financial advisory firm headquartered in Yeovil, Somerset, serving over 5,000 clients across the South West of England through sector-specialist teams in audit, tax, wealth management, corporate finance, and payroll.

Ownership category

akta.pro rank

Headquarters

HQ city

Yeovil

HQ country

United Kingdom

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Accountancy and Audit Services: Comprehensive accountancy services including audit, assurance, bookkeeping, management accounts, and financial statements preparation for businesses and individuals.
2. Tax Advisory Services: Tax planning and compliance services including corporate tax, personal tax planning, inheritance tax, capital gains tax, VAT, R&D tax relief, and tax investigations.
3. Financial Planning and Wealth Management: Financial planning, investment management, pensions, later life planning, and wealth protection services for individuals and families.
4. Corporate Finance: M&A advisory, management buyouts, exit strategy planning, and business succession planning services.
5. Payroll and Auto-enrolment: Payroll processing services and auto-enrolment pension compliance for businesses.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

Old Mill is a South West England-based accountancy and financial advisory firm providing audit, corporate and personal tax, VAT, inheritance tax, R&D tax relief, payroll, corporate finance, and full wealth management services to over 5,000 clients. The firm is organised around sector specialisms including Owner-Managed Businesses, Rural/Farming, Food & Drink, and Property & Construction, with additional services in trusts, forensic accounting, international trade, and SDLT advisory.

Product overview

Old Mill is an accounting, tax, and financial advisory firm serving clients throughout the South West of England. The firm operates as a multi-service practice organized around core service lines including Audit, Tax Services (corporate tax, personal tax, capital gains tax, inheritance tax, VAT, R&D tax relief), Wealth Management (financial planning, pensions, investment management, later life planning), Payroll, Corporate Finance, and specialized sector services (Food & Drink, Rural/Farming, Property & Construction, Owner-Managed Businesses). Additional offerings include Trusts, Family Business Issues, Assurance, Cash Flow Modelling, Exit Strategy and Succession Planning, Forensic Accounting, International Trade, Digital Accounting Services, Protection Planning, and Stamp Duty Land Tax (SDLT). The firm also includes Brook Financial (Ilminster office) as a sub-brand providing bookkeeping, payroll, and VAT services. Old Mill leverages technology partnerships with Xero (Platinum Partner) and Figured for cloud-based accounting and farm financial management.

Differentiator

Problem solved

Functional benefit

Brands

• Brook Financial: Financial management services covering management accounts, cashflow forecasting and budgeting, bookkeeping, payroll and VAT returns, as well as providing advice and assistance with accounting software systems. Located in Ilminster.

Products and services

• Audit
• Tax Services
• Wealth Management
• Financial Planning
• Payroll
• Corporate Finance
• Research and Development (R&D) Tax Services
• Trusts
• Family Business Advisory
• Forensic Accounting
• International Trade Advisory
• Pensions
• Stamp Duty Land Tax (SDLT)
• Brook Financial
• Digital Accounting Services

Quantifiable outcome

• Serving over 5,000 clients throughout the South West
• +1 more outcomes

Named customers7 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

Feature2 records

Partnerships

Five partnerships are on record, tiered core and minor.

• XerocoreTechnology or IntegrationOld Mill is a Platinum Partner with Xero, the cloud accounting software. As a Platinum Partner, the firm resells, implements and supports Xero to clients, providing cloud accounting services and helping businesses move to cloud-based financial management.
• SilverfincoreTechnology or IntegrationSilverfin is a cloud platform used by Old Mill to automate and improve processes for preparing working papers, financial statements, corporation tax and management reports. Rollout continued during the reporting period.
• CurocoreTechnology or IntegrationCuro is the Financial Planning back office system used by Old Mill. The firm began a programme to invest in and modernize the Curo system to reduce risk and make it easier for employees to service clients.
• Kinbrook Group LimitedcoreOthersOld Mill is part of the Kinbrook Group Limited network. The group shares information about clients (including confidential information) among members to offer and provide co-ordinated services. Old Mill is under no obligation to purchase other services from the Group.
• Mogers Drewett (Law Firm)minorImplementation/ SI/ Consulting PartnerWorking relationship with Mogers Drewett law firm for SDLT submissions and property transactions. Old Mill provides SDLT advice, calculations and submissions while the law firm handles conveyancing work.

Scale indicators5 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Bishop Fleming: Top-30 UK accountancy firm headquartered in the South West (Exeter/Taunton) with comparable headcount (c.400 staff), sector-led service lines covering OMB, agriculture, and healthcare, and a parallel mix of accountancy, tax, audit, and wealth advice. Closest direct peer given overlap in geography, vertical mix, and mid-tier positioning.
• PKF Francis Clark: South West-headquartered accountancy and advisory firm with offices across Devon, Cornwall, Somerset, and Dorset — direct geographic overlap with Old Mill. Similar sector specialism in agriculture and OMB, comparable revenue mix across audit, tax, and wealth management, and a longer-established Top-50 UK ranking.
• Albert Goodman: Somerset and Devon-based accountancy, tax, and financial advisory firm serving OMBs, rural, and food & drink clients — strong overlap with Old Mill's vertical mix and South West footprint. Smaller in scale but directly comparable in service breadth and client segmentation.
• Thomas Westcott: Devon-based accountancy firm with comparable service lines (accounts, audit, tax, payroll, wealth) and a similar rural/OMB client base across the South West. Now part of the Sumer Group, offering a useful comparison point on the consolidator pathway versus Old Mill's independent trajectory.
• Forrester Sylvester Mackett: Wiltshire-based mid-tier accountancy and tax advisory firm with comparable sector specialisms (rural, OMB, food & drink) and overlapping geography in the Old Mill catchment. Similar headcount range and client mix, making it a credible like-for-like regional peer.

Broad incumbents

• MHA MacIntyre Hudson: Top-15 UK accountancy network with strong regional presence including South West offices. Comparable service mix (audit, tax, wealth, advisory) but materially larger scale and broader national/international footprint — provides benchmark on what scaled-up Old Mill could look like.
• Crowe UK: Top-10 UK accounting and advisory firm with sector specialisms and OMB/mid-market service lines that overlap with Old Mill. Larger and more national but representative of the consolidator-style competitor pushing into Old Mill's territory.
• Saffery Champness: Top-20 UK accountancy firm with established South West (Bristol/Exeter) presence and similar private-client wealth management and OMB service mix. Larger scale and broader footprint than Old Mill but with overlapping service lines and client segments.
• Azets: PE-backed UK mid-tier accountancy consolidator (formerly Wilkins Kennedy and predecessor firms) rapidly acquiring regional practices. Direct competitive threat to Old Mill in the audit and OMB mid-market, with similar vertical service breadth.

Regional players

• Monahans: Swindon/Wiltshire-based accountancy and advisory firm (now part of the Sumer Group) with comparable OMB, rural, and wealth management services. Operates in the same South West catchment as Old Mill with overlapping client type but distinct urban Wiltshire focus.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/OldMillAFP

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles14 records

Subsidiaries6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Old Mill