London-based HW Fisher appoints Diccon Thornely as partner

Professional services firm HW Fisher has appointed Diccon Thornely as a partner in its London office.

With around 300 staff, HW Fisher is one of the larger accounting and consulting businesses in the Great London region. The firm, which is part of the Sumer Group, works mainly for small businesses, mid-market companies, not-for-profits, charities, high net-worth individuals and the property sector.

Now becoming the firm’s 26th partner, Diccon Thornely bringing nearly 20 years of experience to the partnership. A member of the Audit practice, he supports clients on a wide range of areas, with particular expertise in reporting under UK GAAP and IFRS as well as specialist specific sector reporting. 

His experience in the private sector includes working with full list and AIM-listed entities, as well as private equity-backed organisations. He has also developed significant expertise in the not for profit sector, working extensively with higher education institutions, charities and membership organisations.

Thornely joins HW Fisher from Sedulo, where he managed to double the size of its Audit team and implemented a number of quality improvement initiatives. Prior to his role at Sedulo, he spent 15 years at Grant Thornton.

“I am thrilled to be joining HW Fisher, a firm with such a strong reputation for excellence and innovation in the industry,” said Thornely. “I look forward to applying my experience and knowledge to help grow the firm's audit capabilities, implement quality-focused initiatives, and continue to deliver exceptional service to clients across all sectors.”

Andrew Rich, Managing Partner at HW Fisher, commented: "We are delighted to welcome Diccon to the firm. His proven track record in building high-performing audit teams combined with his excellent technical expertise across multiple sectors will be invaluable as we continue to grow our practice. His arrival significantly bolsters our Audit practice and enhances our ability to serve the increasingly complex needs of our clients.”

HW Fisher became part of the Sumer Group in October 2024. Sumer Group employs more than 2,000 people across ​​43 offices nationwide.