Fiona Lyon

Partner, Family Law and Divorce Solicitor

Fiona heads the teams of Family Law and Divorce Solicitors in our London Euston and Teddington offices.

She has more than 11 years’ experience in Family Law and Divorce, and specialises in Divorce Financial Orders and Financial Settlements and private client Children Law matters, often with an international element. 

She has a strong reputation in the resolution of relationship breakdown from all types of families, including same-sex relationships, unmarried couples and inter-family relations where expertise in Trusts and Property Law is required. 

Fiona has considerable experience in complex high profile and high net worth divorce cases but works with clients with varied financial backgrounds and from all walks of life. She is skilled in drafting and negotiating Prenup and Postnuptial agreements

Fiona is committed to helping families separate constructively, commercially and amicably where possible but has a proven track record as a Litigator when circumstances dictate, which can include emergency Court applications such as Injunctions. 

Fiona at Simpson Millar was fabulous! I was stuck in a difficult family matter and was out of my depth. She organised me, explained in easy to understand English what I had to do and when. She was super responsive and didn’t ever give up on my fight even at times I felt like doing just that! I was facing costs of over £5k and 2 court hearings which was due to my bully of an ex husband yet she kept me calm, we didn’t go to court and she saved me nearly all of my costs. Thank you Simpson Millar, especially Fiona, you kept me sane and saved me a lot of expense! Lucy, Bristol

Fiona has an excellent rapport with expert Counsel and works hard to ensure that the right team is assembled for each individual case. Fiona adopts a sensitive approach to her clients, is proactive to meet their objectives and is cost conscious.

Above all, Fiona ensures that the protection of the children of the family is put at the forefront of settlement discussions and the minds of the parties when considering the future.


Fiona obtained her Law degree from University of Manchester, and qualified as a Solicitor in March 2008. She joined Simpson Millar in 2017 from a top Legal 500 firm in the South-East UK.

Fiona is a member of Resolution, the national organisation of Family Lawyers committed to non-confrontational divorce, separation and other family problems.

I would like to take this opportunity to say thank you to Fiona and the team for dealing with my matter so swiftly. Even under a difficult circumstance, such as a divorce, it was a pleasure dealing with such a professional and diligent company as Simpson Millar. Please convey my appreciation to Fiona for making this process as straightforward and painless as possible. Miss Rachel Turnbull

Interests outside of work

Fiona is a keen runner and swimmer. She is a former rower but now only exercises on dry land. Fiona also enjoys travelling the world, theatre and the arts.

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