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Claire van Overdijk

Claire van Overdijk

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Claire van Overdijk is a specialist public law and private client barrister, with expertise in private international law.

Her public law practice covers a wide variety of contexts concerning both local and central government and non-governmental departmental bodies. She has particular expertise in community care, healthcare, ordinary residence disputes, cases affecting children and vulnerable adults, and those involving a human rights claim (particularly false imprisonment/unlawful detention). Claire is frequently instructed in the High Court, Court of Appeal and specialist tribunals in the public law field. She was appointed to the Attorney General’s B Panel in 2016 following two years on the C panel.

Claire’s private client practice focuses on contentious probate and family provision claims and administration disputes involving allegations of breach of trust, including the removal of trustees/personal representatives. Owing to her expertise in private international law, Claire’s practice frequently extends to advice in relation to cross border disputes concerning trusts, estates, foreign succession and domicile. In the mental capacity context, Claire advises in relation to LPA/EPAs, deputy applications, gift and statutory will applications, and applications for the removal/substitution of P as trustee.

Claire has extensive experience in mental capacity law, is ranked by Chambers and Partners for her expertise in the jurisdiction of the Court of Protection (Health & Welfare and Property & Affairs) and is described as “go-to counsel for international mental capacity matters”. She is the first and currently the only practitioner at the Bar to date to be recognised as a leader in both areas of the COP’s jurisdiction. Claire’s mental capacity practice is complemented by her public law and private client practice, which enables her to provide tailored advice to clients as appropriate. She receives instructions from a range of clients such as the Office of the Public Guardian, the Official Solicitor, public bodies (local authorities, NHS Trusts/ CCGs, central government), deputies and private individuals.

As well as being an editor of Court of Protection Practice (LexisNexis) and a correspondent for the Private Client Business Journal, Claire is an author of International Protection of Adults (OUP), a text which has widely benefitted private client practitioners working in the complex area of cross border mental capacity law. In her spare time, Claire serves as Deputy Chair of the STEP Mental Capacity Global SIG Steering Committee, Secretary of the Court of Protection Barristers Association, and a committee member of COPPA (London).

Noteworthy cases

The Public Guardian v Matrix Deputies Ltd & Anor [2017] EWCOP 14

Represented the Public Guardian in an application to discharge a professional deputy firm as deputy for all its deputyship appointments (42 in total).

Re V (A Child) (Recognition of Foreign Adoption) [2017] EWHC 1733 (Fam)

Represented the Secretary of State for the Home Department in relation to an application for the recognition under common law of a Nigerian adoption order.

RE CD (A Child) (Notice of Care Proceedings to Father without Parental Responsibility) [2017] EWFC 34

Appeared as advocate to the court in this case which concerned an application to dispense with service of care proceedings on the biological father of a child subject to the proceedings.

Matter of MMAM (2016) (COP)

Represented the proposed deputy of P (following previous proceedings concerning P’s unauthorised removal from England to Saudi Arabia considered in MASAM v MMAM, MM LB of Hackney and Homerton University NHS Foundation Trust [2015] EWCOP 3) in circumstances where the deputy was resident in Dubai, and P continued to reside in Saudi Arabia.

AXD v Home Office No1 [2016] EWHC 1133 (QB); AXD v Home Office (No2) [2016] EWHC 1617 (QB)

Represented the Home Office in an unlawful detention claim concerning a Somali refugee who had been diagnosed as suffering from paranoid schizophrenia and was detained in immigration detention, which spanned five years in total.

Re MM (A Patient) sub nom Teresa Kirk v (1) Devon CC (2) MM (by his litigation friend, the Official Solicitor) (2015)

Represented Ms Kirk, the sister of P who had been removed from the jurisdiction to Portugal whilst proceedings were ongoing in the Court of Protection. The Court made various orders requiring P to be returned to the UK and seeking foreign judicial assistance from the Portuguese courts. Later contempt and appeal proceedings in this matter are reported at [2016] EWCOP 42; [2016] EWCA Civ 1221; and [2017] EWCA Civ 34.

Kebbeh v Farmer & Ors [2015] EWHC 3827 (Ch)

Inheritance (Provision for Family and Dependants Act) 1975 application where the deceased’s second wife was claiming that he was domiciled in the UK at the time of his death, but defendants to the claim (executors and beneficiaries) argued that he was domiciled in Gambia and thus the wife had no claim under the 1975 Act. Issues also arose in relation to the recognition of an Islamic divorce carried out in the Gambia. Represented the defendants.

An English Local Authority v SW [2014] EWCOP 43 (Moylan J)

Represented the English Local Authority at the earlier stages of these proceedings which concerned the international jurisdiction of the Court of Protection. The proceedings considered the position (in particular the habitual residence) of a Scottish woman placed by the Scottish statutory authorities in a rehabilitation placement in England.

LB Redbridge v G, C and F [2014] EWHC 485 (COP)

Represented the local authority in this case, which concerned the inherent jurisdiction of the High Court in relation to vulnerable adults who are said to be subject to duress.

S (by his litigation friend the Official Solicitor) v SSHD [2014] EWHC 50 (Admin)

Represented the SSHD in proceedings concerning the detention pending removal of an unlawful overstayer who suffered from serious mental illness. Successfully overturned on appeal on the application of the SSHD: [2015] EWCA Civ 652.

Muwonge v SSHD [2014] UKUT 514 (IAC)

Represented the SSHD in this case, which gives detailed guidance relating to the management and settlement of judicial review proceedings in the Upper Tribunal.

Re O [2013] EWHC 3932 (COP); [2013] WLR (D) 495 (Sir James Munby P)

Represented the daughter of an elderly incapacitated lady who had been removed from the jurisdiction to Scotland by her son. It was held that the COP had no jurisdiction to exercise its functions under the MCA 2005 in relation to P as she was no longer habitually resident in England & Wales.

Re HA [2012] EWHC 1068 (COP)

Represented the local authority in this matter, which sets out the interrelation between s.21A MCA 2005 challenges and the court’s welfare jurisdiction and the implications for legal aid.


  • Court of Protection Practice (Jordan Publishing), co-editor: annual publication; leading text for practitioners and the judiciary
  • International Protection of Adults (Oxford University Press), co-editor: comparative analysis of private international law rules relating to mental capacity law and the Hague Convention on the International Protection of Adults
  • Private Client Business (Sweet & Maxwell), Elder Law Correspondent – leading journal for all those involved with private client work
  • Mental Capacity Law and Practice (3rd Edition) (Jordan publishing), co-editor.


  • 2014- present: Part-time member of University College London, Faculty of Law teaching in private international law (LL.M)
  • 2008 to 2014: Part-time member of University College London, Faculty of Law teaching in public international law (LL.B)

Appointments & Memberships

  • Administrative Law Bar Association
  • Chancery Bar Association
  • Court of Protection Practitioners Association
  • Society of Trust and Estate Practitioners (full member)
  • STEP Mental Capacity Global SIG Steering Committee (elected member)


  • Portuguese
  • Spanish

Claire van Overdijk is regulated by the Bar Standards Board (BSB) and holds a current practising certificate. If you are not satisfied with the service provided, please click here.

Areas of Law


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“She’s a tenacious advocate who certainly holds her ground in court and isn’t afraid to make difficult points.” Health & Welfare, Chambers & Partners 2019

“A go-to counsel for international mental capacity matters, she has a really good practice and she really knows her stuff.” Property & Affairs, Chambers and Partners 2019

“She’s very responsive, reliable and practical.” Property & Affairs, Chambers and Partners 2019

“She responds to a huge amount of emails and manages her workload really well. In terms of her actual work, I send her to court and can leave her to it, she’s completely independent. I have seen her cross examine and she is completely fearless.” Health & Welfare, Chambers & Partners 2018

“She has a sharp mind, her preparations are excellent and she is patient with lay clients.” Property & Affairs, Chambers and Partners 2018

“Noted for having a broad Court of Protection practice and being strong on mental capacity issues generally. As well as having a strong practice, she has published a number of texts relating to the Court of Protection.”
Health & Welfare, Chambers & Partners 2017

“She’s very good, very approachable, very friendly and willing to provide advice outside of cases.”
Health & Welfare, Chambers & Partners 2017

“Has a practice that encompasses both property and affairs and health and welfare matters. She acts for a range of clients, such as individuals, local authorities, the Official Solicitor and financial deputies. She is well known for her work in cases concerning statutory wills, gifts, trusts and disputed deputyships.”
Property & Affairs, Chambers and Partners 2017

“She’s very calm. We had an aggressive opponent, but Claire was very professional and a very good advocate.”
Property & Affairs, Chambers and Partners 2017

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