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William Day
Barristers profile
UK Bar 2026
Barristers profile | UK Bar 2026: Banking & Finance, Financial Services, Fraud: Civil, Insurance, Restructuring/Insolvency, Commercial Dispute Resolution
William Day
Ranked in 6 Practice Areas
3

Band 3

Banking & Finance

London (Bar)

4 Years Ranked

4

Band 4

Financial Services

London (Bar)

3 Years Ranked

4

Band 4

Fraud: Civil

London (Bar)

3 Years Ranked

4

Band 4

Insurance

London (Bar)

2 Years Ranked

4

Band 4

Restructuring/Insolvency

London (Bar)

4 Years Ranked

5

Band 5

Commercial Dispute Resolution

London (Bar)

4 Years Ranked

Ranked in Guides
Global 2025

About

Provided by William Day

UK Bar

Practice Areas

Wiliam’s practice spans all aspects of commercial litigation and arbitration. He has particular experience in banking and financial services, commercial fraud, insurance, and company law and insolvency disputes. A number of his cases are cross-border in nature and raise complex jurisdiction and choice of law issues. As well as an extensive interlocutory and trial practice, William has significant appellate experience having appeared led and unled in over 10 appeals.

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 $400mcredit 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 £265mclaim 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, FSLA, BILA, ILA, CFLA, Society of Legal Scholars.

Chambers Review

Provided by Chambers

UK Bar

Banking & Finance - London (Bar)

3
Band 3
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.

Learn more about this team❖View ranking table

Fraud: Civil - London (Bar)

4
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 bear on the banking and finance aspects of civil fraud matters.

Learn more about this team❖View ranking table

Financial Services - London (Bar)

4
Band 4
Individual Editorial

William Day 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.

Learn more about this team❖View ranking table

Restructuring/Insolvency - London (Bar)

4
Band 4
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.

Learn more about this team❖View ranking table

Insurance - London (Bar)

4
Band 4
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.

Learn more about this team❖View ranking table

Commercial Dispute Resolution - London (Bar)

5
Band 5
Learn more about this team❖View ranking table

Strengths

Provided by Chambers

He is committed, detail-oriented, measured and keen to get stuck in.

Banking & Finance respondent
UK Bar

William is extraordinarily bright and really good.

Banking & Finance respondent
UK Bar

He was very good at flexing his tone to match the judge; he was more aggressive and forceful, but can also be measured.

Banking & Finance respondent
UK Bar

He is hugely industrious and is very hard-working.

Fraud: Civil respondent
UK Bar

He is tremendously hard-working, has excellent written advocacy and is a really effective junior ensuring the best points are brought to light.

Fraud: Civil respondent
UK Bar

He gives very commercial advice and totally understands the commercial dynamics as well as being brilliant on the law.

Fraud: Civil respondent
UK Bar

William is very thorough and has a great academic background, his written work is excellent and he has a great client manner.

Financial Services respondent
UK Bar

He gets things turned around quickly and is very good on his feet.

Restructuring/Insolvency respondent
UK Bar

He's good on paper and good on his feet.

Restructuring/Insolvency respondent
UK Bar

He is down to earth, accessible and always responds to you straight away.

Restructuring/Insolvency respondent
UK Bar

He is extremely bright and very user-friendly.

Restructuring/Insolvency respondent
UK Bar

William is exceptionally hard-working and efficient, with confident advocacy and a masterful grip of the legal issues.

Restructuring/Insolvency respondent
UK Bar

William Day has fierce intellect and he is very hardworking.

Insurance respondent
UK Bar

William is extremely competent, great with clients and instructing solicitors.

Insurance respondent
UK Bar

Will combined excellent subject matter knowledge with a very helpful and approachable delivery, and was always on hand whenever his input was required.

Insurance respondent
UK Bar

A class act, Will is user-friendly, super smart, astonishingly hard-working, incredibly impressive and composed on his feet. He is as cool as a cucumber against the most eminent opposition in court.

Commercial Dispute Resolution respondent
UK Bar

William Day is technically fantastic. He is able to take on a huge workload and is incredibly easy to deal with.

Commercial Dispute Resolution respondent
UK Bar

William Day's written advocacy was absolutely superb. He is very, very clever, user-friendly and really easy to work with.

Commercial Dispute Resolution respondent
UK Bar

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