Department profile
Sinclair Gibson LLP

Family/Matrimonial Finance: High Net Worth

High Net Worth Guide 2026 : UK-wide


Sinclair Gibson LLP

Rankings

About

Provided by Sinclair Gibson LLP

The family team, led by Kathryn Peat, advises HNW and UHNW clients on all aspects of family law. The team is recognised for its expertise in complex financial remedy proceedings, nuptial agreements, private children matters, and cases involving international assets, trusts and jurisdictional issues. It also advises unmarried couples on cohabitation matters, Schedule 1 Children Act applications, TOLATA claims, cohabitation agreements and wider wealth protection arrangements.

Clients benefit from the team's close collaboration with the firm's private client and disputes departments, particularly on matters involving substantial wealth, succession planning and cross-border family structures. Nuptial and cohabitation agreements are frequently incorporated into wider wealth-planning strategies.

The team has extensive experience in Non-Court Dispute Resolution (NCDR), helping clients resolve disputes confidentially and efficiently outside the court process. Its expertise spans arbitration, mediation, early neutral evaluation, private FDRs and round table meetings, often combining different forms of NCDR to meet clients' specific objectives.

Kathryn served as a Recorder for more than 20 years and practises as an arbitrator in financial and children matters. Senior Associate Xanthy Papageorgiou is a Resolution-trained mediator who assists couples in reaching agreement on financial and child arrangements issues through a constructive and non-confrontational mediation process.

Chambers Review

Provided by Chambers

Family/Matrimonial Finance: High Net Worth - UK-wide

Band 4

Band 4


What the Team is Known For

Sinclair Gibson's family practice advises on complex matrimonial financial matters and private children work. The team regularly handles cases involving internationally held assets, offshore trusts and business interests.

Strengths

Provided by Chambers

  • I always felt like an important client and was always treated with sensitivity and a high level of care and professionalism.

    Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
  • Sinclair Gibson has pleasant individuals who understand the need to be sensitive and discreet when necessary.

    Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
  • Sinclair Gibson’s family team distinguishes itself through its exceptional expertise in high-value and internationally complex family law matters. The department’s partner‑led, bespoke approach and close integration with the firm’s private client specialists provide clients with seamless, high‑level advice.

    Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
  • Sinclair Gibson offers exceptional advice which not only maximises client outcomes but mitigates risk from start to finish. The team provides thoughtful advice that covers all aspects of family law proceedings.

    Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth

Notable Practitioners

Provided by Chambers

  • Band 5Kathryn Peat
    Band 5Kathryn Peat

    Kathryn Peat

    Kathryn Peat is a founding partner of Sinclair Gibson and is experienced in advising high net worth individuals in matrimonial finance and children disputes. Peat is also a qualified arbitrator.

    • Kathryn Peat is a fantastic and very experienced lawyer.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
    • Kathryn Peat is one of the classiest lawyers at the family Bar. She is completely unflappable and personable.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
    • Kathryn Peat is very knowledgeable and has a very nice manner.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
    • Kathryn Peat is highly respected, with a really sharp brain, excellent detail and a strong sense of strategy. She knows how to play out the case to the client and is an excellent strategist.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
  • Associates to watchXanthy Papageorgiou
    Associates to watchXanthy Papageorgiou

    Xanthy Papageorgiou

    Xanthy Papageorgiou is a senior associate at Sinclair Gibson who acts on financial disputes, TOLATA claims and nuptial agreements.

    • Xanthy is very warm with clients and very good at settling cases.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
    • Xanthy Papageorgiou provides good advice, prompt action and attention to detail. She always acts in a compassionate and professional manner.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
    • Xanthy offers a five-star client service with a tireless approach and exceptional professionalism.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
    • Xanthy Papageorgiou is very empathetic. She offers a personal service and is always quick to respond.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth
    • Xanthy is an absolutely exceptional lawyer. She is so meticulous with numbers and how things break down. She is really exceptional.

      Family/Matrimonial Finance: High Net Worth respondentHigh Net Worth

Ranked Individuals at Sinclair Gibson LLP (2)

UK-wide

Members

Provided by Sinclair Gibson LLP

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