Kyri Lefteri has a specialist family practice, with particular emphasis on children work.
Kyri successfully undertook his pupillage at New Court Chambers in 2006, and has since become an integral and respected member of Chambers.
Kyri has experience in all aspects of children law, including Public and Private law proceedings, Adoption and Child Abduction. He is regularly instructed in lengthy finding of fact hearings, final hearings and appeals, together with interim hearings and interlocutory applications.
Kyri is known for a clear, pragmatic approach and for providing robust yet sensitive advocacy in highly emotive cases. Kyri places particular emphasis on achieving proportionate and child-focused outcomes, whether through negotiation or contested hearings, and is adept at advising clients at all stages of proceedings, from early advice to final hearings and appeals.
He regularly supports training events and seminars for his clients and is keen to discuss any particular training needs his clients may have.
Kyri practises in public law family proceedings, representing local authorities, parents, extended family members, and children’s guardians. Kyri has experience in cases involving allegations of neglect, non-accidental injury, sexual abuse, substance misuse, mental health concerns, FII and complex family dynamics.
Kyri is recognised for thorough preparation and measured, effective advocacy in cases where the stakes are exceptionally high. With a strong understanding of the statutory framework and the need for fairness and proportionality, Kyri works diligently to protect clients’ rights while maintaining a clear focus on the welfare of the child.
Kyri has appeared in numerous high profile and reported cases is ranked as a leader in his field by Legal 500 and Chambers and Partners.
Reported cases:
Kyri regularly acts in applications concerning child arrangements, parental responsibility, specific issue and prohibited steps orders, relocation, and cases involving allegations of domestic abuse.
Kyri is known for a calm and measured approach to emotionally charged disputes, combining careful preparation with clear and effective advocacy. Kyri provides practical, realistic advice and is committed to achieving child-focused outcomes, whether through negotiated resolution or contested hearings. Kyri is frequently instructed at all stages of proceedings, including urgent and interim hearings through to final determination
I am registered with the Information Commissioner’s Office (ICO) as a Data Controller for the personal data that I hold and process as a barrister. My registered address is New Court Chambers, Temple, London EC4Y 9BE and my registration number is Z9811800.
All of the information that I hold about you is provided to or gathered by us in the course of your case and/or proceedings. Your solicitor and I will tell you why we need the information and how we will use it.
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I do not use automated decision-making in the processing of your personal data.
I collect and process both personal data and special categories of personal data as defined in the GDPR. This includes:
Client data
I store my case files on Microsoft One Drive which is a cloud hosted environment.
I am satisfied that such transferred data is fully protected and safeguarded as required by the General Data Protection Regulation.
I retain your personal data while you remain a client unless you ask me to delete it.
My Retention and Disposal Policy (copy available on request) details how long I hold data for and how I dispose of it when it no longer needs to be held. I will delete or anonymise your information at your request unless:
The General Data Protection Regulation gives you specific rights around your personal data. For example, you have to be informed about the information I hold and what I use it for, you can ask for a copy of the personal information I hold about you, you can ask us to correct any inaccuracies with the personal data I hold, you can ask us to stop sending you direct mail, or emails, or in some circumstances ask us to stop processing your details. Finally, if I do something irregular or improper with your personal data you can seek compensation for any distress you are caused or loss you have incurred. You can find out more information from the ICO’s website https://ico.org.uk/for_the_public/personal_information and this is the organisation that you can complain to if you are unhappy with how I dealt with you.
You may request access to, correction of, or a copy of your information by contacting me at klefteri@newcourtchambers.com.
I will occasionally update my Privacy Notice. When I make significant changes, I will notify you of these by email. I will also publish the updated Notice on my website profile.
“A very effective advocate, who is also very pleasant with it. Kyri is just very hardworking and someone who knows his stuff. In and out of court, he’s fair and never unnecessarily confrontational.”
Chambers & Partners 2026
“Kyri displays excellent client rapport and is a skilled and persuasive advocate.”
Chambers & Partners 2026
“A tenacious advocate, who will go above and beyond to troubleshoot cases.”
Chambers & Partners 2026
“Kyri is a formidable advocate with the clients’ interests in mind at all times. He is a real joy to watch in cross-examination and tactically alert at all times.”
Legal 500 2026
“He is a meticulous and really formidable advocate, who always has his client’s best interests at heart.”
Chambers & Partners 2025
“Ever well prepared and business-like, he is strong on the law and well respected by clients and opponents.”
Chambers & Partners 2025
“A highly skilled Children Act litigator able to manage complex cases and ensure that clients feel involved at every step.”
Chambers & Partners 2025
“Kyri is a rock-solid performer.”
Legal 500 2025
“Kyri Lefteri is a really strong public law practitioner who shows real commitment to his clients. He has a fluent style of advocacy and can handle cases where difficult issues arise.”
Chambers & Partners 2024
“An incredibly thorough, good, incisive cross-examiner, whose knowledge of his cases is second to none.”
Chambers & Partners 2024
“Kyri’s cross-examination is always on-point and his advocacy is lethal in its focus.”
Chambers & Partners 2024
“He’s an excellent advocate who is a pleasure to work with and very good at non-accidental injury cases.”
Legal 500 2024
“A personable, strong and highly capable advocate who approaches cases in a pragmatic fashion.”
Legal 500 2024
“An able advocate who handles complex borderline care cases and historic sex abuse allegations.”
Chambers & Partners 2023
“No case is too difficult for him.”
Chambers & Partners 2023
“His professionalism, the quality of his research and his advocacy skills all impress.”
Chambers & Partners 2022
“He approaches his cases with vigour even when appearing in front of the most difficult judges.”
Chambers & Partners 2022




Accreditations
