About image

Welcome to Derwen Accountancy

Situated in Pontyclun, we are an independent chartered accountancy practice which offers a friendly and proactive service, utilising our wealth of experience.


We tailor our approach to each client’s individual needs by firstly getting to understand them and their organisation, as well as their personal and business goals. Our goal is to help your business grow by providing a high level of service and becoming a trusted adviser.


We assist a diverse range of organisations with their accountancy and taxation needs, ranging from sole traders to large incorporated business and not for profit organisations. We can assist at all stages in an organisation’s life cycle from start-ups, to established businesses or as we say from Acorns to Oaks.

This is me

Hi all,

I’m Helen Williams FCA and I have over fifteen years of accountancy practice experience. I qualified as a Chartered accountant in 2007 and have worked with a wide range of organisations since then. These range in size from sole traders to multi-million-pound international groups and they operate within a vast array of sectors, including sweet shops, builders, financial advisers, and charities, to name but a few.

The reason I set up in practice was so I may utilise my experience and knowledge in a friendly, down to earth, common-sense way to assist people, and organisations, to achieve their goals.