William Tyzack joined Guildhall Chambers as a Door Tenant in 2019. He continues to practice from Queen Elizabeth Building in London.
A large part of William’s practice involves Administrative & Public Law, including complex financial claims on divorce, and frequently involving trusts, companies and conflicts of law issues. Cases involving Private International law and the application of EU regulations form a major part of his practice.
He is often instructed in child abduction cases under the 1980 Hague Convention and in applications for relocation. William has advised solicitors on English law across many EU and worldwide jurisdictions, and provided written and oral evidence on English law in foreign courts. He has lectured on International law issues both in the UK and abroad.
William has acted on behalf of trustees, beneficiaries, and companies, and has advised and represented clients in applications under the Inheritance (Provision for Family and Dependants) Act 1975.
Alongside this, William practises in the Court of Protection in cases relating to both Health and Welfare, and Property and Financial Affairs. He has been instructed in complex financial cases involving breaches by donees and deputies of their fiduciary duties, challenges to the validity of Lasting Powers of Attorney, and decisions in relation to the use of P’s assets.
In respect of health and welfare, William has been instructed in cases involving care issues, serious medical treatment, and the removal of P from the jurisdiction. He has acted in cases involving vulnerable adults under the inherent jurisdiction, and has experience of cases involving wider areas of Public law.
William has been instructed in a number of recent cases in a public law context:
William has experience of cases involving immigration and National Security issues, and was appointed in 2018 to the Attorney General’s Panel of Special Advocates.
William is regularly instructed in cases involving complex jurisdiction, forum, and international enforcement issues under domestic and EU law. He has represented private individuals and companies in cases in the English courts involving:
On a number of occasions William has been asked to provide expert evidence to foreign courts on English law, or the English court’s approach to aspects of EU law.
Uhd v McKay (Abduction: Publicity)  2 FLR 1159
Kelly v Pyres (Domicile)  1 FLR 62
J v U (Child Arrangements Order: Jurisdiction)  2 WLR 760
Hayatleh v Mofdy (Presumption of Marriage)  EWCA Civ 70
Re W (Children)  All ER (D) 88
Re R (Reunite International Child Abduction Centre and others)  2 WLR 1583
AB v JJB (EU Maintenance Regulation: modification procedure)  2 FLR 1143
C v B  EWHC 2069
EY v RZ  EWHC 4403 (Fam)
FL v Registrar General  2 FLR 630
William acts in Court of Protection cases involving all aspects of Health and Welfare, and Property and Financial Affairs.
He has provided training to solicitors on the law relating to Mental Capacity and is the correspondent of the Elder Law section of the Private Client Business Journal.
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