Oliver Mosley

Called to the Bar:2018

  • Overview

    A notable junior with a flair for advocacy, Oliver Mosley is a capable barrister with a keen tactical mind.

    Corporate & Financial Crime

    Oliver specialises in corporate and financial crime, demonstrating an aptitude for complex matters well beyond his year of call.

    Since April 2024, Oliver has been instructed as junior prosecution counsel by the Anti-Corruption Commission of Seychelles in relation to Operation Black Iron: the high-profile trial of the former President's First Lady and his Economic Advisor for corruption, abuse of authority and money laundering. The operation was set-up to investigate the alleged theft of $50m loaned to Seychelles by the United Arab Emirates in 2002, but now spans the decades the economic advisor held public office.

    Oliver has previously prosecuted and defended a diverse range of cases relating to fraud, money laundering and corporate dishonesty. In recent years he has been instructed on high-profile corporate crime cases, from investigations into failings at the Post Office, to allegations of fraudulent misrepresentation at G4S in relation to government contracts.

    Oliver is adept at navigating and advising on document-heavy cases involving extensive disclosure as part of large trial teams and as sole counsel.

    Crime

    Oliver is an experienced prosecutor who is regularly instructed to act in serious and high-profile matters in the Crown Court. He is a Grade 3 CPS advocate and has been appointed to two specialist panels, Serious Crime and Fraud, at Grade 2 level.

    He is a sought-after defence advocate in the Crown Court. Oliver regularly acts in a range of matters including firearms offences, gang matters, and serious violence. He has been commended by his instructing solicitors for his sound judgement, persuasive style, and client care.

    Oliver is a registered youth court advocate and has completed vulnerable witness training.

    Regulatory

    Oliver has experience in a variety of regulatory work for various bodies. He is a registered case presenter for the Nursing and Midwifery Council, the General Dental Council and for Social Work England.

    Private Prosecutions

    Oliver has experience with private prosecutions on behalf of multinational corporate clients, a specialist practice area within chambers.

    In previous years he has worked on cases involving the supply of illicit streams in prosecutions brought by the Premier League, BT Sport and Sky plc, supported by Trading Standards and FACT. This has included supporting initial advisory work and pre-charge investigations as well as disclosure review.

    He recently wrote an article published in The Barrister explaining the use of private prosecutions in relation to illicit streaming. 

    Notable Cases

    Josephine Hamilton & others v Post Office Limited

    R v Seed (Michael)

    R v Varley, Jenkins, Kalaris and Boath

    Appointments

    • CPS - External Advocates Panel (Grade 3)
    • CPS Specialist Panel - Rape and Serious Sexual Offences 
    • CPS Specialist Panel - Serious Crime (Grade 3)
    • CPS Specialist Panel - Fraud (Grade 2)
    • Serious Fraud Office - Counsel Panel C
    • Nursing and Midwifery Council - Authorised Case Presenter
    • Youth Court - registered advocate; YJLC trained
    • CPS-Bar Diversity & Inclusion Committee
    • Independent Panellist, Ministry of Justice Public Appointments

    Professional Memberships

    • The Criminal Bar Association
    • The Young Fraud Lawyers Association
    • The Honourable Society of the Middle Temple
    • Member of the Bar of Seychelles (2024)

    Education

    • Diplock Scholar - The Honourable Society of the Middle Temple (2017 – 2018)
    • Master of Laws - City Law School, University of London (2017 – 2018)
    • Graduate Diploma in Law - City Law School, University of London (2016 – 2017)
    • MA (Cantab.) Human, Social and Political Sciences - University of Cambridge (2013 – 2016)

       

    Privacy Notice

    Recent Cases

    News

    Articles

    • Private Prosecution: The quiet battle against illegal streaming

      In this month’s edition, Oliver Mosley writes for The Barrister about the ‘quiet battle’ against illegal streaming operators through the use of private prosecutions, and the vital impact this can have on these criminal networks. This fol...

      Read more

    • Bullied in court? Here's what our chambers can do about it

      It is vital that chambers support individuals who have suffered bullying. QEB Hollis Whiteman has now adopted an external bullying policy. A panel of barristers within Chambers (including a senior QC) will now address complaints of bullying by judges, sol...

      Read more

    • The Use of Drill Music in Criminal Trials Part IV - Racial Bias and the Future

      This podcast forms part of a 4-part series on the use of drill music in criminal trials, in which Oliver speaks with senior and junior counsel about their experiences with drill music in court.In this final part, Oliver Mosley speaks with Fallon Alexis<

      Read more

    • The Use of Drill Music in Criminal Trials Part III - Experts and Exclusion Strategies

      This podcast forms part of a 4-part series on the use of drill music in criminal trials, in which Oliver Mosley speaks with senior and junior counsel about their experiences of drill music in court. In Part III, Oliver speaks to Read more

    • The Use of Drill Music in Criminal Trials Part II - The Defence Response

      This podcast forms part of a 4-part series on the use of drill music in criminal trials in which Oliver Mosley speaks with senior and junior counsel about their experiences of drill music in court. In Part II, Oliver speaks with William Boyce QC about ...

      Read more

    • A Podcast: The Use of Drill Music in Criminal Trials Part I - The Prosecution Case

      This podcast forms part of a 4-part series on the use of drill music in criminal trials, in which Oliver Mosley speaks with senior and junior counsel about their experiences with drill music in court. In Part I, Oliver speaks with former Senior Treasur...

      Read more

    • The Use of Gang Affiliation as Evidence of Bad Character

      Oliver Mosley of QEBHW examines gang affiliation as evidence of bad character.The word gang can be a powerful tool in the hands of a skilled prosecutor. The allowances within the Criminal Justice Act means juries are now often furnished with evidence abou...

      Read more

    • Cracking the Enigma Code: A, B, D & C and Regina [2021] EWCA Crim 128

      A case comment on Enchrochat and A, B, D & C and Regina [2021] EWCA Crim.The Court of Appeal have recently handed down their judgment in the Encrochat test case: A, B, D & C and Regina [2021] EWCA Crim.In this article, Roger Smart and Read more

  • Corporate and Financial Crime

    A sought-after, forensic, and intelligent advocate well-versed in complex frauds.

    Overview

    Oliver specialises in corporate and financial crime, demonstrating an aptitude for complex matters well beyond his year of call.

    Since April 2024, Oliver has been instructed as junior prosecution counsel by the Anti-Corruption Commission of Seychelles in relation to Operation Black Iron: the high-profile trial of the former President’s First Lady and his Economic Advisor for corruption, abuse of authority and money laundering. The operation was set-up to investigate the alleged theft of $50m loaned to Seychelles by the United Arab Emirates in 2002, but now spans the decades the economic advisor held public office.

    Oliver has previously prosecuted and defended a diverse range of cases relating to fraud, money laundering and corporate dishonesty. In recent years he has been instructed on high-profile corporate crime cases, from investigations into failings at the Post Office, to allegations of fraudulent misrepresentation at G4S in relation to government contracts.

    Oliver is adept at navigating and advising on document-heavy cases involving extensive disclosure as part of large trial teams and as sole counsel.

    Experience 

    Oliver’s practice spans a range of complex, high-profile corporate and financial crime cases.

    Over the past two years, Oliver was instructed as part of the case team for Hickman & Rose that successfully defended the former CEO of G4S. He was responsible for extensive disclosure review, drafting, and directly briefing the client and leading counsel.

    During the Covid pandemic, Oliver managed a team of barristers reviewing more than 900 historic prosecutions conducted by the Post Office, on behalf of Peters & Peters. Oliver’s role included briefing leading counsel on progress, reviewing disclosure, and drafting advice on the safety of previous convictions. The disclosure review was commended by the Court of Appeal for its diligence.

    Oliver is an experienced trial advocate, prosecuting and defending in a diverse range of fraud matters. As sole-instructed counsel, Oliver recently acted for an individual accused of fraudulently obtaining Covid-grants by mispresenting their company’s size and trading status. He is currently instructed in relation to an HMRC operation to disrupt the unlawful importation of alcohol via mirror load frauds. As led junior counsel, Oliver recently acted for the lead defendant in a £3.2m goods diversion fraud.

    Oliver is a Grade 3 prosecutor for the CPS, and a Grade 2 prosecutor for their Specialist Fraud Division. He regularly prosecutes and advises on dishonesty offences including fraud by abuse of position and money laundering, as well as proceedings brought under the Proceeds of Crime Act.

    Oliver began his career in chambers on the SFO prosecutions of Alstom and Barclays. This included research work for leading and junior prosecution counsel used to assist in assessing the implications for future SFO prosecutions dependant on the identification principle following Tesco and Barclays.

    Prior to joining Chambers, Oliver gained experience working for a United Nations NGO and as a parliamentary researcher. He studied international relations at the University of Cambridge, specialising in corruption and the pressures on state institutions during democratic backsliding in the Middle East and Africa.

    Recent Cases

  • Crime

    An impressive advocate with a persuasive style, Oliver regularly defends and prosecutes in a range of criminal matters.  

    Overview 

    Oliver is an experienced prosecutor who is regularly instructed to act in serious and high-profile matters in the Crown Court. He is a Grade 3 CPS advocate and has been appointed to two specialist panels, Serious Crime and Fraud, at Grade 2 level.

    He is a sought-after defence advocate in the Crown Court. Oliver regularly acts in a range of matters including firearms offences, gang matters, and serious violence. He has been commended by his instructing solicitors for his sound judgement, persuasive style, and client care.

    Oliver is a registered youth court advocate and has completed vulnerable witness training.

    Experience 

    As a Grade 3 prosecutor and experienced defence advocate, Oliver is regularly instructed in a range of serious criminal matters for defendants with complex needs.

    He has extensive experience in domestic offending. His recent successes include defending a defendant accused of voyeurism during a marital breakdown, and defending an allegation of domestic ABH, threats to kill, and controlling and coercive behaviour.

    Oliver regularly acts for vulnerable clients. He recently concluded a sensitive child cruelty case, defending a mother who had herself been a victim of domestic abuse at the hands of her co-defendant husband. The Crown offered no evidence after months of legal argument and representations, including extensive disclosure review.

    As a prosecutor, he has experience in a range of serious matters. Oliver is currently instructed as junior counsel in two separate multi-handed attempted murders at the Central Criminal Court, previously acted as a prosecution junior in a double attempted murder involving a gang rivalry in North London, and was recently led in a multi-million-pound county lines drugs conspiracy.

    Oliver also recently concluded acting as prosecution junior counsel in a National Crime Agency of a multi-handed conspiracy to import drugs using Encrochat.

    He regularly advises the CPS on charges for matters including drugs enterprises, sexual offences, and serious violence.

    Oliver has defended in complex fraud matters. In November 2022, he acted as junior counsel for the first defendant in a £3.2 million goods diversion fraud. Both lead and junior counsel were only instructed the week before trial. He has experience in high-profile SFO cases, having worked on the prosecution of Alstom SA and Barclays PLC as well as the defence of a former G4S executive (See Corporate and Financial Crime).

    Oliver is particularly experienced in gang-related offending and recently successfully acted for a young defendant in a gang-related firearms prosecution running duress despite the defendant accepting joining the gang voluntarily. He recently released a four-part podcast on the use of drill music evidence, building on his Masters’ dissertation on the use of gang evidence as bad character. 

    He has previously been instructed in numerous gang cases, including the prosecution of a high-profile drill artist, and has consulted for the CPS policy unit on the creation of draft guidance on the use of drill in criminal trials.

    He has experience with complex disclosure exercises. Aside from his experience in SFO prosecutions, he has previously acted as independent disclosure counsel for Sussex Police in connection with a major Health and Safety prosecution for gross negligence manslaughter, and has experience prosecuting cases with sensitive disclosure and public interest immunity considerations in relation to National Crime Agency cases.

    Recent Cases

    News

    • Philip Stott and Oliver Mosley prosecute shooting in Walthamstow

       Following their conviction after a trial in January and February 2023 at the Central Criminal Court, three defendants yesterday received sentences of 15-17 years imprisonment for the attempted murder of Kaan Cicek in November 2017. Mr Cicek was shot at s...

      Read more

    Articles

    • The Use of Drill Music in Criminal Trials Part IV - Racial Bias and the Future

      This podcast forms part of a 4-part series on the use of drill music in criminal trials, in which Oliver speaks with senior and junior counsel about their experiences with drill music in court.In this final part, Oliver Mosley speaks with Fallon Alexis<

      View article

    • The Use of Drill Music in Criminal Trials Part III - Experts and Exclusion Strategies

      This podcast forms part of a 4-part series on the use of drill music in criminal trials, in which Oliver Mosley speaks with senior and junior counsel about their experiences of drill music in court. In Part III, Oliver speaks to View article

    • The Use of Drill Music in Criminal Trials Part II - The Defence Response

      This podcast forms part of a 4-part series on the use of drill music in criminal trials in which Oliver Mosley speaks with senior and junior counsel about their experiences of drill music in court. In Part II, Oliver speaks with William Boyce QC about ...

      View article

    • A Podcast: The Use of Drill Music in Criminal Trials Part I - The Prosecution Case

      This podcast forms part of a 4-part series on the use of drill music in criminal trials, in which Oliver Mosley speaks with senior and junior counsel about their experiences with drill music in court. In Part I, Oliver speaks with former Senior Treasur...

      View article

    • The Use of Gang Affiliation as Evidence of Bad Character

      Oliver Mosley of QEBHW examines gang affiliation as evidence of bad character.The word gang can be a powerful tool in the hands of a skilled prosecutor. The allowances within the Criminal Justice Act means juries are now often furnished with evidence abou...

      View article

    • Cracking the Enigma Code: A, B, D & C and Regina [2021] EWCA Crim 128

      A case comment on Enchrochat and A, B, D & C and Regina [2021] EWCA Crim.The Court of Appeal have recently handed down their judgment in the Encrochat test case: A, B, D & C and Regina [2021] EWCA Crim.In this article, Roger Smart and View article

  • Regulatory

    A methodical barrister with a calm, considered, and robust approach to regulatory cases.

    Overview 

    Oliver has experience in a variety of regulatory work for various bodies. He is a registered case presenter for the Nursing and Midwifery Council, the General Dental Council and for Social Work England.

    Experience 

    Oliver is experienced in all stages of regulatory proceedings from interim orders to final hearings and restoration panels. He has worked in a variety of more complex regulatory matters.

    This included an eight-day final disposal in which he acted for Social Work England in respect of a complex matter involving over 15 heads of charge. The case resulted in a finding of impairment and the registrant’s suspension.

    He has assisted colleagues in the research and preparation for their regulatory cases. This has included extensive research for the Gambling Commission, as well as research on the law of entrapment, the lawfulness of test purchases, and the differing regulatory obligations within the regulatory sector.

  • Private Prosecutions

    As a commercially astute junior with a clear focus on the details, Oliver is well placed to act in private prosecutions.

    Overview 

    Oliver has experience with private prosecutions on behalf of multinational corporate clients, a specialist practice area within chambers.

    In previous years he has worked on cases involving the supply of illicit streams in prosecutions brought by the Premier League, BT Sport and Sky plc, supported by Trading Standards and FACT. This has included supporting initial advisory work and pre-charge investigations as well as disclosure review.

    He recently wrote an article published in The Barrister explaining the use of private prosecutions in relation to illicit streaming. 

    Recent Cases

    Articles

    • Private Prosecution: The quiet battle against illegal streaming

      In this month’s edition, Oliver Mosley writes for The Barrister about the ‘quiet battle’ against illegal streaming operators through the use of private prosecutions, and the vital impact this can have on these criminal networks. This fol...

      View article