Russell Cooke Bedford Row Holborn

About Katie

My role is to help people navigate what can be one of the most difficult times of their lives. I understand both the emotional and legal issues involved when a relationship breaks down and use my professional skills with my considerate but determined approach to get matters resolved in the best way possible.

Katie advises across the full breadth of family law with many of her cases involving an international element. She is a Resolution trained family mediator in financial and private law children matters.

Her specialist acumen is in cases involving international child relocation and disputes involving child arrangements. She advises on divorce, relationship breakdown and managing the associated financial matters. She also assists with the drafting of nuptial agreements. Her clients range from HNW individuals, international entrepreneurs and families of inherited wealth. 

Katie is ranked in Chambers HNW 2023 (Band 5 for Family/Matrimonial Finance: High Net Worth - London) as well as a Recommended Lawyer in Legal 500 2024.

Katie is passionate about all her clients, capable, unflappable and very well respected by her peers.
The Legal 500 (2025)

Education

  • Read History at King’s College London, 2000-2003
  • Completed the General Diploma in Law (GDL) at the College of Law, London, 2003-2005
Kate is a good lawyer and mediator.
Chambers UK (2025)

Experience

Katie qualified in 2007, joining the boutique family law firm Alexiou Fisher Philipps as a solicitor in 2011, later becoming a partner at the firm in 2016.

She has been involved in the following notable cases: 

  • Re L (Residence: Jurisdiction), the Court of Appeal case W (Children) on relocation
  • the influential High Court decision JKN v JCN addressing the jurisdiction of a transatlantic divorce
Katie Longmate has cemented herself in the mediation world. A super human touch regularly helps clients reach successful outcomes.
The Legal 500 (2025)

Memberships

Katie is a:

  • member of Resolution and its Wellbeing Committee

Katie's highlights

News

29.04.2025

Family and criminal law: when two legal systems meet

It is not uncommon for someone in the middle of family proceedings to find themselves in need of help from the police or advice from a criminal lawyer, or vice...
Family and children partner - Katie Longmate | Russell-Cooke
Katie Longmate
3 min Read
News

04.04.2025

Russell-Cooke family and children lawyers recommended in Doyle’s Family rankings

Russell-Cooke's family and children lawyers have been recognised in The Doyle’s Guide 2025 London Family Law Rankings...
James Carroll, Managing Partner in the Russell-Cooke Solicitors, family and children team. Family and children partner - Katie Longmate | Russell-Cooke
Multiple Authors
1 min Read
James Carroll, Katie Longmate
News

11.12.2024

The future of financial remedies: what the Law Commission’s review may mean for an ‘out of date’ system—Today’s Family Lawyer

Partner Katie Longmate has contributed an article to Today’s Family Lawyer ahead of the publication of the Law Commission’s scoping report on the law governing financial remedies due this month.
Family and children partner - Katie Longmate | Russell-Cooke
Katie Longmate
1 min Read
View all News & Insights