Sonia Simms has been committed to serving the community since she was called to the Bar in 1993. She has volunteered as a legal advisor and advocate for a number of organisations.

In the mid 1990s Sonia co-founded a legal advice clinic at the Priory Centre in Acton, West London, where she, together with her co-founder, provided free legal advice to members of the public.  The Advice given covered consumer rights, housing, employment, personal injury and crime. 

Sonia also volunteered as a legal advisor at the Community Advice Programme (CAP) Ealing, a pioneering programme that provided free legal advice to members of the local community. 

As an advocate Sonia has volunteered with the Free Representation Unit, where she represented clients in social security and employment tribunals.

Sonia is currently a volunteer with Advocate, (formerly the Bar Pro Bono Unit). She represents clients who cannot afford legal representation. She is also a panel member of the Teaching Regulation Agency. The role involves hearing and determining allegations of misconduct against members of the teaching profession. This is an unpaid judicial appointment.