Constance McDonnell KC specialises in trusts and probate disputes.
She has appeared in a number of highly publicised cases, including Reeves v Drew (a probate dispute about the £100m estate of an illiterate testator). She has appeared twice in the UK Supreme Court: as Junior Counsel in the landmark case of Ilott v The Blue Cross and recently in Hirachand v Hirachand, concerning whether a CFA success fee can be recoverable as part of an award under the 1975 Act. Constance also has an international practice.
Prior to taking Silk in 2019, Constance won the ‘Chancery Junior of the Year’ award at the 2018 Chambers Bar Awards, and was recommended as a ‘Star Individual’ in Chambers UK Bar Guide 2019 and High Net Worth Guide 2018. Constance won the ‘Barrister of the Year’ Gold Award at the 2023 Citywealth Magic Circle Awards.
Constance regularly advises on, and appears in Court in, applications in the Court of Protection relating to patients’ property and affairs.
Constance accepts instructions in offshore matters and has appeared recently both in the Bermuda Supreme Court and in the Bermuda Court of Appeal. She has also advised in relation to trust disputes proceeding in the Royal Court of Guernsey, as well as in relation to cross-border administration in respect of estates in England and Wales.
“Constance is extremely impressive, both in her grasp of issues and opportunities, and in her written work and her client manner. She's an invaluable asset in any team. ”
Chambers & Partners 2026
“Constance McDonnell is the best probate silk. She knows the probate world inside out.”
Chambers & Partners 2026
“She is extremely impressive in her grasp of issues and opportunities, her written work and her client manner. She's an invaluable asset in any team. ”
Chambers & Partners High Net Worth 2025
“Constance McDonnell is the best probate silk. She knows the probate world inside-out and can run arguments. ”
Chambers & Partners High Net Worth 2025
“She is exceptional, absolutely brilliant with clients but also has a brilliant way of winning an argument without the other party even realising they are conceding. She is razor sharp. ”
Chambers & Partners High Net Worth 2025
“She is not only technically outstanding but also absolutely unflappable. Constance provides robust, well-balanced advice whilst never failing to recognise the human side of the work she does.”
Chambers & Partners 2025
“She has the best judgement of any barrister that I have worked with - her assessment of a case is never wrong. She is also brilliant in court, very good to deal with and super-approachable. ”
Chambers & Partners 2025
“Constance is a brilliant advocate and is the archetypal 'iron fist in a velvet glove'. ”
Chambers & Partners 2025
“Constance combines deep knowledge with an ability to get on with all client types and is a powerfully persuasive advocate. Her attention to detail is second-to-none, fully immerses herself in her cases and gives her all to every brief.”
Legal 500 2025
“Constance is a brilliant advocate and is the archetypal iron fist in a velvet glove. She is an absolute star.”
Chambers & Partners High Net Worth 2024
“She is not only technically outstanding but she is absolutely unflappable. Constance provides robust, well-balanced advice while never failing to recognise the human side of the work she does.”
Chambers & Partners High Net Worth 2024
“She has the best judgement for any barrister that I have worked with. Her assessment of a case is never wrong. She is also brilliant in court, very good to deal with and super approachable. ”
Chambers & Partners High Net Worth 2024
“Constance McDonnell KC is highly respected in the traditional chancery market for her handling of the most high-profile matters. She focuses on probate and contentious trusts, and also handles the administration of estates.”
Chambers & Partners 2024
“She is a robust negotiator.”
Chambers & Partners 2024
“Constance is truly excellent - great technical knowledge and sound judgement, the go-to silk for probate disputes.”
Chambers & Partners High Net Worth 2023
“Constance is at the top of her field. Her knowledge, especially around the issue of testamentary capacity, is unparalleled. ”
Chambers & Partners High Net Worth 2023
“My go-to on contentious probate work. Constance is really experienced, really good, really robust and clients love her. Her technical knowledge is the best you can get.”
Chambers & Partners High Net Worth 2023
“I am not sure if there are enough superlatives for her, she just always gets it right. She just knows the law inside out and is practical in her approach. Her advocacy is spot on. ”
Chambers & Partners 2023
“Constance is at the top of her game - a leader in this field. She is an incredible advocate, clear and concise in court and fights hard for the client.”
Legal 500 2023
The Supreme Court handed down judgment this morning in Hirachand v Hirachand, holding that CFA success […]
The Supreme Court handed down judgment this morning in Hirachand v Hirachand, holding that CFA […]
Constance McDonnell KC and George Vare, assisted by Anneliese Mondschein, acted on behalf of the […]
Constance McDonnell KC and George Vare, assisted by Anneliese Mondschein, acted on behalf of the […]
Serle Court is pleased to announce that Richard Wilson KC, Dakis Hagen KC, Constance McDonnell KC, Giles Richardson KC, Thomas Fletcher and Adil Mohamedbhai have all been ranked in the list of the world’s elite lawyers advising UHNW clients.
Constance McDonnell KC will be speaking at the upcoming ThoughtLeaders4 HNW Divorce 'Trusts in Divorce: The 3rd […]
Serle Court has once again been recognised in The Legal 500 Caribbean 2026, achieving top-tier set rankings and 42 recommendations across its offshore practice.
On Tuesday, 7 October at 17:30, Constance McDonnell KC will join Christopher Wagstaffe KC of 29 […]
For general enquiries and instruction advice, please contact our Practice Management Team:
Call: +44 (0)20 7242 6105
or email: clerks@serlecourt.co.uk
Constance McDonnell KC
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