William Day

Ranked in 6 Practice Areas

Band 4

Banking & Finance

London (Bar)

3 Years Ranked

Band 4

Fraud: Civil

London (Bar)

2 Years Ranked

Band 5

Restructuring/Insolvency

London (Bar)

3 Years Ranked

Band 6

Commercial Dispute Resolution

London (Bar)

3 Years Ranked

Up and Coming

Financial Services

London (Bar)

2 Years Ranked

Up and Coming

Insurance

London (Bar)

1 Years Ranked

Ranked in Guides

Global 2024

About

Provided by William Day

UK Bar

Practice Areas

William is a versatile barrister with extensive interlocutory, trial, and appellate experience. His practice spans all aspects of commercial litigation and arbitration. He has particular experience in banking and financial services disputes, commercial fraud cases, insurance litigation, and company law and insolvency matters. A number of his cases are cross-border in nature and raise complex jurisdiction and choice of law issues. Alongside practice, William is an Associate Professor and Fellow in Law at Downing College, Cambridge.

William’s current and recent instructions include acting for Deutsche Bank in a €500m foreign exchange and interest rate derivatives dispute; Liberty Steel in a $400m credit insurance coverage dispute arising out of the collapse of Greensill Bank; Dubai Islamic Bank in a $400m Islamic financing dispute following the administration of NMC Healthcare; the liquidators of Arena TV in a £265m claim in connection with a major asset based lending fraud; and Bernie Ecclestone, defending a claim by Felipe Massa over the circumstances of Lewis Hamilton’s 2008 F1 title win.

Career

Called 2016, Inner Temple. Fellow in Law at Downing College, Cambridge. Formerly Solicitor, Allen & Overy.

Professional Memberships

COMBAR, ChBA, LCIA, Society of Legal Scholars.

Chambers Review

Provided by Chambers

UK-Bar

Fraud: Civil - London (Bar)

Band 4

Individual Editorial

William Day is fast becoming a go-to junior for high-value multi-jurisdictional fraud cases. He brings his previous experience as a solicitor to advise on banking and finance aspects of civil fraud matters.

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Banking & Finance - London (Bar)

Band 4

Individual Editorial

William Day is a much sought-after junior who has significant experience in banking litigation. He has knowledge of investment-related disputes and asset recovery actions, among other areas.

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Restructuring/Insolvency - London (Bar)

Band 5

Individual Editorial

William Day is an exceptionally well-regarded junior adept at advising on a range of insolvency proceedings. He has been instructed on liquidations, administrations and bankruptcies which often involve unusual and novel issues. Recent instructions have also seen Day appear at all levels up to the Supreme Court.

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Commercial Dispute Resolution - London (Bar)

Band 6

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Financial Services - London (Bar)

Up and Coming

Individual Editorial

William Day is a rising star who is often junior of choice for the FCA, both led and unled, in contentious financial services matters. His financial services practice is complemented by vast expertise across banking litigation and insolvency.

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Insurance - London (Bar)

Up and Coming

Individual Editorial

William Day is recognised for his involvement in several high-profile business interruption insurance litigations. He regularly acts for policyholders within these disputes.

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Strengths

Provided by Chambers

Will is a superstar. He couples a brilliant mind for technical and strategic issues with outstanding client-handling skills. I would instruct him on anything.

Fraud: Civil respondent
UK-Bar

William is intellectually brilliant and I was really impressed with his ability to master very difficult points of law in a short period. A star of the future.

Fraud: Civil respondent
UK-Bar

Will is well liked and trusted by the silk teams he works with and is very commercial and knowledgeable. The breadth of his legal knowledge is phenomenal and his advocacy is very fluent.

Fraud: Civil respondent
UK-Bar

On his feet, Will is perfectly calm, yet robust and incisive, which impresses his instructing solicitors and clients in equal measure.

Banking & Finance respondent
UK-Bar

Will's written and oral advocacy is truly exceptional. His capacity for work is extraordinary, and he is completely unflappable under pressure.

Banking & Finance respondent
UK-Bar

William has superb legal skill and ability. He is great to work with and works so hard, being utterly committed to the client and getting the best outcomes.

Banking & Finance respondent
UK-Bar

William has a brilliant mind for technical and strategic issues, with outstanding client-handling skills.

Banking & Finance respondent
UK-Bar

William is a very talented lawyer. He has a great commercial practice in both banking and insolvency. He's really effective and applies his mind effectively, working out implications.

Restructuring/Insolvency respondent
UK-Bar

William is intellectually phenomenal. Also, because he worked in private practice, he understands the solicitors' and barristers' roles perfectly.

Commercial Dispute Resolution respondent
UK-Bar

Will is one of the best juniors I've worked with. He has the most broad shoulders of any junior I've come across and he is well liked and trusted by the silk teams he works with.

Commercial Dispute Resolution respondent
UK-Bar

William Day is exceptionally bright and intellectually brilliant, and really impresses with his ability to master very difficult points of law in a short time. He is a star of the future.

Commercial Dispute Resolution respondent
UK-Bar

William Day is an outstanding barrister with an exceptional talent for framing complex commercial issues and developing legal arguments in a brilliant way.

Commercial Dispute Resolution respondent
UK-Bar

William is an excellent junior. He is confident, hard-working and on top of the detail.

Financial Services respondent
UK-Bar

The thing that sets William apart is that he has a commercial mind and he really gets in the trenches for his clients.

Insurance respondent
UK-Bar

An all-round excellent junior who is always at the top of the list when considering a new instruction.

Insurance respondent
UK-Bar

William is extraordinarily talented for his year of call; he is intellectually phenomenal.

Insurance respondent
UK-Bar

Will is a superstar. He couples a brilliant mind for technical and strategic issues with outstanding client-handling skills. I would instruct him on anything.

Fraud: Civil respondent
UK-Bar

William is intellectually brilliant and I was really impressed with his ability to master very difficult points of law in a short period. A star of the future.

Fraud: Civil respondent
UK-Bar

Will is well liked and trusted by the silk teams he works with and is very commercial and knowledgeable. The breadth of his legal knowledge is phenomenal and his advocacy is very fluent.

Fraud: Civil respondent
UK-Bar

On his feet, Will is perfectly calm, yet robust and incisive, which impresses his instructing solicitors and clients in equal measure.

Banking & Finance respondent
UK-Bar

Will's written and oral advocacy is truly exceptional. His capacity for work is extraordinary, and he is completely unflappable under pressure.

Banking & Finance respondent
UK-Bar

William has superb legal skill and ability. He is great to work with and works so hard, being utterly committed to the client and getting the best outcomes.

Banking & Finance respondent
UK-Bar

William has a brilliant mind for technical and strategic issues, with outstanding client-handling skills.

Banking & Finance respondent
UK-Bar

William is a very talented lawyer. He has a great commercial practice in both banking and insolvency. He's really effective and applies his mind effectively, working out implications.

Restructuring/Insolvency respondent
UK-Bar

William is intellectually phenomenal. Also, because he worked in private practice, he understands the solicitors' and barristers' roles perfectly.

Commercial Dispute Resolution respondent
UK-Bar

Will is one of the best juniors I've worked with. He has the most broad shoulders of any junior I've come across and he is well liked and trusted by the silk teams he works with.

Commercial Dispute Resolution respondent
UK-Bar

William Day is exceptionally bright and intellectually brilliant, and really impresses with his ability to master very difficult points of law in a short time. He is a star of the future.

Commercial Dispute Resolution respondent
UK-Bar

William Day is an outstanding barrister with an exceptional talent for framing complex commercial issues and developing legal arguments in a brilliant way.

Commercial Dispute Resolution respondent
UK-Bar

William is an excellent junior. He is confident, hard-working and on top of the detail.

Financial Services respondent
UK-Bar

The thing that sets William apart is that he has a commercial mind and he really gets in the trenches for his clients.

Insurance respondent
UK-Bar

An all-round excellent junior who is always at the top of the list when considering a new instruction.

Insurance respondent
UK-Bar

William is extraordinarily talented for his year of call; he is intellectually phenomenal.

Insurance respondent
UK-Bar

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Silks (KC)

All Circuits

Consumer Finance

Ian Wilson KC

Band 1

William Day

UK Bar Guide 2025

Banking & Finance + 5 more rankings

About

Practice Areas

Career

Professional Memberships

Chambers Review

UK-Bar

Fraud: Civil - London (Bar)

Individual Editorial

Banking & Finance - London (Bar)

Individual Editorial

Restructuring/Insolvency - London (Bar)

Individual Editorial

Commercial Dispute Resolution - London (Bar)

Financial Services - London (Bar)

Individual Editorial

Insurance - London (Bar)

Individual Editorial

Strengths

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Silks (KC)

All Circuits

London (Bar)

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