Mark Rennie

Partner

Family

Mark is a family law specialist advising on all areas of matrimonial law and assisting parties in resolving financial disputes arising from the breakdown of their relationship. He has particular experience in dealing with cases which involve business ownership.

Known as an effective litigator, handling complex disputes in both high and mid net worth cases, Mark seeks to bring a warm and human touch to a process which some people can find difficult. It is his aim for his clients to feel supported throughout.

In addition to matrimonial law, Mark frequently advises on Inheritance Act claims and will disputes. He has successfully negotiated many pre-nuptial agreements and has a keen interest in wealth preservation.

Mark can also advise and assist if you are not married but need support resolving your financial situation following the breakdown in your co-habitation.

Mark works primarily in our Horsham office but also collaborates closely with colleagues in our other locations.

Work highlights

ULTRA HIGH NET WORTH DIVORCE

GA v EL [2023] EWFC 187 and GA v EL (No. 2) [2023] EWFC 206. The case concerned a single issue; how to divide the proceeds of sale of a business that was started during the marriage but sold after separation. The case considered the importance/relevance of historic business valuations and the courts approach to post separation endeavour.

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Services

Mark is a total rock for his clients. He's unflappable, completely determined to do the absolute best, utterly meticulous and a supreme tactician.

Chambers and Partners UK 2026

Mark is an absolute delight to work with. He is super with clients, a good strategist and he is sensible and easy to work with.

Chambers and Partners UK 2025

Mark Rennie was pragmatic in his approach, and applied suitable pressure at the right time against the other side.

Legal 500 UK 2025

Chambers & Partners UK 2026

Legal500 2026 Recommended Lawyer

Videos

Choosing your executors: why it matters and how to get it right

Disputes between executors are on the rise, so choosing the right people for the role is vital, as is ensuring your wishes are clearly communicated.

07/07/2026

Events

Bankruptcy, Insolvency and Family Law Matters seminar, Guildford 8 September 2026

Our expert Family Law team in Guildford invite you to join us for breakfast and refreshments where we partner with 29 Bedford Row to deliver insight into Bankruptcy, Insolvency and Family Law Matters.

Podcasts

Neurodivergence in Court Proceedings

In this episode, our family law experts discuss the challenges around neurodivergence in family court proceedings.

08/06/2026

Insights

Landmark High Court judgment clarifies approach to international surrogacy cases

Significant new High Court judgment clarifies and advances the law on parental orders in international surrogacy cases.

01/05/2026

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