Tax specialist Helen Lewis joins Old Mill as Private Client Tax Director

With more than 25 years in professional services, Helen advises high-net-worth individuals, business owners and landed estate families on complex tax and succession matters. Her experience also includes three years with leading tax publisher Tolley, where she contributed to technical publications including Simon’s Taxes and Tolley Guidance. 

Her arrival as Private Client Tax Director adds further specialist expertise to Old Mill’s growing advisory offering, at a time when families, business owners and their professional advisers are facing increasingly complex decisions around tax, succession and preserving wealth for future generations.

Helen began her career in professional practice in 2000, qualifying as a Chartered Accountant, Chartered Tax Adviser and Trust and Estate Practitioner. Over the following two decades, she advised owner-managed businesses, private clients and high-net-worth families across a broad range of tax matters. 

For five years, Helen was Technical Director within a specialist landed estates team, focusing on inheritance tax, capital gains tax and trust planning for landed estate families. 

She later moved to Tolley, where she spent three years writing for authoritative technical tax publications, further developing the technical expertise she now brings to Old Mill. 

David Maslen, Head of Tax at Old Mill, said: 

“Helen brings an exceptional depth of technical expertise, particularly in inheritance tax, trusts and estate planning, where clients and their advisers are navigating significant challenges. 

“Her experience combines many years of advising private clients and landed estate families with an impressive background in technical tax research and publishing. That combination is hugely valuable, not only in supporting our clients but also in developing the knowledge and expertise of our wider tax team. 

“We are continuing to invest in specialist talent and broaden our advisory capabilities, and Helen’s appointment is an important part of that ambition. Being part of Kinbrook Group also gives us opportunities to collaborate with specialists across the wider business, bringing together complementary expertise to support clients with their evolving needs.” 

Helen Lewis, Private Client Tax Director at Old Mill, said: 

“I am delighted to have joined Old Mill at an exciting stage in its development. Having spent much of my career advising private clients and landed estate families, I’m looking forward to bringing that experience to the team and working with colleagues to support clients on challenging tax and estate planning matters. 

“The opportunity to combine specialist technical expertise with a collaborative, client-focused approach is particularly appealing, and I’m looking forward to contributing to the continued development of Old Mill’s private client advisory offering.”

Old Mill became part of Kinbrook Group in November 2025, joining a growing group of established professional services businesses across the UK. Together, they provide access to expertise spanning accountancy, tax, audit, financial planning, legal, corporate finance and wider business advisory services. 

Helen’s appointment builds on that collective expertise, strengthening the specialist support available to private clients while contributing to Kinbrook Group’s ambition to provide comprehensive, joined-up advice to individuals, families and businesses across the UK. 

To find out how Old Mill’s private client tax specialists can support your inheritance tax, trust and estate planning needs, get in touch with our team today.