Theo Barclay

Ranked in 4 Practice Areas

Band 3

Costs Litigation

All Circuits

2 Years Ranked

Band 4

Intellectual Property

London (Bar)

1 Years Ranked

Band 4

Professional Negligence

London (Bar)

1 Years Ranked

Band 4

Sport

London (Bar)

2 Years Ranked

About

Provided by Theo Barclay

UK Bar

Practice Areas

Theo Barclay’s practice encompasses business disputes, sports law, intellectual property and costs law. He appears before domestic and international tribunals, with current and recent cases in the Supreme Court, Court of Appeal, High Court, LCIA and SIAC tribunals.

Theo’s commercial practice is wide-ranging, spanning civil fraud, banking and finance, intellectual property, corporate and professional negligence litigation and arbitration. His sports law practice is similarly broad, including regulatory and disciplinary issues, player/agent disputes, IP disputes and commercial litigation in a sports context. He also specialises in costs law, with a particular focus on litigation funding disputes and solicitor/client matters.

His work is frequently international in nature, including international arbitration and English Court litigation involving foreign law.

He has appeared in leading cases across his areas of expertise, including in the Supreme Court and Court of Appea

Professional Memberships

Theo is a member of COMBAR, the British Association of Sport & Law, the PNBA and the Financial Services Law Association.

Chambers Review

Provided by Chambers

UK-Bar

Costs Litigation - All Circuits

Band 3

Individual Editorial

Theo Barclay advises on a full range of costs matters. He has in-depth experience in the sector, having appeared in several high-profile costs cases in recent years and at various levels of court including the Supreme Court. He also regularly appears before the Senior Courts Costs Office. Barclay acts in cases both led and unled, and has an international element to his costs practice.

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Intellectual Property - London (Bar)

Band 4

Individual Editorial

Theo Barclay of 4 New Square Chambers is a talented and experienced barrister attracting ample praise for his soft IP practice with a particular adeptness in brand litigation. He focuses on trade mark infringement cases and frequently appears in the IPEC and Court of Appeal.

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Sport - London (Bar)

Band 4

Individual Editorial

Theo Barclay is a strong barrister highlighted for his expertise in football, where he frequently acts on behalf of high-level players and clubs.

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Professional Negligence - London (Bar)

Band 4

Individual Editorial

Theo Barclay acts for claimants and defendants in a variety of professional negligence claims. He is particularly adroit in handling claims against tax advisers and accountants arising out of failed tax schemes.

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Strengths

Provided by Chambers

Theo is always attentive and responsive. He quickly grasps the underlying commercial context of a case and ensures that he is focused on the bigger picture when advising.

Costs Litigation respondent
UK-Bar

Theo handles legal complexities with ease, communicates in a personable and client-friendly style, is an excellent advocate and is brilliant to have on your team.

Intellectual Property respondent
UK-Bar

An exceptionally bright and commercial barrister. Theo is calm and unflappable under pressure, with a particular talent for thinking on his feet to respond to unexpected points with apparent ease.

Intellectual Property respondent
UK-Bar

Theo is very user-friendly, an incisive and succinct advocate.

Intellectual Property respondent
UK-Bar

Theo is a really excellent barrister.

Sport respondent
UK-Bar

Theo is one of the most succinct lawyers I have ever worked with in terms of running a case and his drafting ability. He is definitely a star of the future.

Professional Negligence respondent
UK-Bar

It is very easy to work with Theo to get the right results for the clients.

Professional Negligence respondent
UK-Bar

Theo is always attentive and responsive. He quickly grasps the underlying commercial context of a case and ensures that he is focused on the bigger picture when advising.

Costs Litigation respondent
UK-Bar

Theo handles legal complexities with ease, communicates in a personable and client-friendly style, is an excellent advocate and is brilliant to have on your team.

Intellectual Property respondent
UK-Bar

An exceptionally bright and commercial barrister. Theo is calm and unflappable under pressure, with a particular talent for thinking on his feet to respond to unexpected points with apparent ease.

Intellectual Property respondent
UK-Bar

Theo is very user-friendly, an incisive and succinct advocate.

Intellectual Property respondent
UK-Bar

Theo is a really excellent barrister.

Sport respondent
UK-Bar

Theo is one of the most succinct lawyers I have ever worked with in terms of running a case and his drafting ability. He is definitely a star of the future.

Professional Negligence respondent
UK-Bar

It is very easy to work with Theo to get the right results for the clients.

Professional Negligence respondent
UK-Bar

Filter by

Silks (KC)

All Circuits

Construction: Professional Negligence

Ben Patten KC

Band 1

Theo Barclay

UK Bar Guide 2025

Costs Litigation + 3 more rankings

About

Practice Areas

Professional Memberships

Chambers Review

UK-Bar

Costs Litigation - All Circuits

Individual Editorial

Intellectual Property - London (Bar)

Individual Editorial

Sport - London (Bar)

Individual Editorial

Professional Negligence - London (Bar)

Individual Editorial

Strengths

Discover other Barristers at 4 New Square Chambers

Silks (KC)

All Circuits

London (Bar)

Discover other Barristers at
4 New Square Chambers