Oliver Mosley

Called to the Bar:2018

  • Overview

    A sought-after junior with a flair for advocacy, Oliver Mosley is a talented barrister with a keen tactical mind.

    Overview

    Oliver is an experienced barrister with specialist experience in the prosecution and defence of serious crime, corporate & financial crime and private prosecutions.

    His aptitude for complex matters is significantly beyond his year of call, and he is highly sought-after in document-heavy matters. This has previously included review work for Post Office and G4S, as well as research on Barclays. As instructed Junior Counsel he recently acted in London Mining, and spent a year working internationally instructed by the Seychelles Anti-Corruption Commission in Operation Black Iron.

    Oliver’s practice includes the full spectrum of serious crime, including violent crime and serious sexual offences. He specialises in gang and drill cases which was the topic of his Masters’ thesis as well as a 4-part podcast he released, as well as serious sexual offences including historic child sex offences. He has also been instructed in several major drugs operations by both the CPS and NCA and is routinely instructed to defence in serious and complex criminal matters.

    He is well-versed in representing vulnerable clients with complex needs, including children and those with neurodivergent disorders.

    Oliver also consults for production companies on script, costume and set for television shows and films which include legal scenes.

    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 (2024-25)

    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)

       

    Recent Cases

    News

    Articles

    • LIBOR - an article by Oliver Mosley

      LIBOR was never intended to be a pillar of the global financial markets. The ‘London Inter-Bank Offered Rate’ was an obscure mechanism developed in the 1980s to set interest rates for commercial lending, set by panels of major banks.Our latest...

      Read more

    • The 'Manchester 10' - an article by Oliver Mosley

      In November 2020, following a series of violent clashes between the M40 and RTD gangs, including the murder of John Soyoye, Ademola Adedeji and nine others were alleged to have conspired in a Telegram chat to attack and kill members of RTD.Our latest arti...

      Read more

    • 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 forensic and intelligent advocate well-versed in complex frauds.

    Overview

    Oliver has worked on a range of complex, high-profile corporate and financial crime cases since the beginning of his practice.

    He is adept at navigating and advising on document-heavy cases involving extensive disclosure, as part of large trial teams and as sole counsel. He was instructed by Peters & Peters on behalf of Post Office in relation to their historic prosecutions of sub-postmasters, and by Hickman & Rose in the SFO prosecution of G4S executives for the alleged fraudulent procurement of government contracts. He is currently acting for a former executive at London Mining alleged by the SFO to have secured contracts in Sierra Leone through bribery.

    Oliver recently returned from a year abroad instructed by the Anti-Corruption Commission of Seychelles in Operation Black Iron. This is the largest anti-corruption case in the nation’s history, investigating the alleged theft of a $50m loan from the UAE to Seychelles in 2002 as well as extensive governmental corruption. 

    Oliver is a Grade 3 prosecutor for the CPS, and a Grade 2 prosecutor for their Specialist Fraud Division.

    Notable Cases

    SFO v Hossie, Rhodes & Armon [London Mining]
    2nd junior counsel for Mr Armon, accused of conspiring to make corrupt payments to secure Government contracts in Sierra Leone on behalf of London Mining Plc.

    Anti-Corruption Commission Seychelles v Mukesh Valabhji and Sarah René [Operation Black Iron]
    2nd junior counsel in the prosecution of the former First Lady and Economic Advisor to the Seychelles Government. The case included the alleged theft of a $50m loan from the UAE in 2002, as well allegations that funds had been corruptly siphoned from the sale of state-owned hotels before being laundered through a global network of illicitly owned companies.

    SFO v Jardine, Preston and Morris [G4S]
    Instructed by Hickman and Rose for Mr Morris, the former CEO of G4S UK alleged to have fraudulently misrepresented the company’s profits when securing and operating Ministry of Justice contracts for the electronic monitoring of suspects and offenders.

    R v PK and others
    Junior counsel to the first defendant alleged to have operated a £3.2m goods diversion fraud using a network of mirror loads designed to evade customs and duties.

    Hamilton and others v Post Office
    Instructed by Peters & Peters to manage a team of barristers reviewing 900 prosecutions conducted by Post Office against their sub-postmasters between 2003 and 2013.

    Recent Cases

    Articles

    • LIBOR - an article by Oliver Mosley

      LIBOR was never intended to be a pillar of the global financial markets. The ‘London Inter-Bank Offered Rate’ was an obscure mechanism developed in the 1980s to set interest rates for commercial lending, set by panels of major banks.Our latest...

      View article

  • Crime

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

    Overview 

    Oliver specialises in general crime and has extensive experience prosecuting and defending in matters including serious violence, domestic offences, sexual offences, kidnapping, blackmail and complex drug importations.

    He is regularly sought after for his subject-matter expertise on cases involving gangs’ evidence and has advised the CPS and Bar Council on their respective guidance; Oliver’s masters’ thesis was on the use of gang affiliation evidence in criminal trials.

    Oliver has been commended by his instructing solicitors and the Police for his sound judgement, persuasive style, and client care. He is particularly skilled at navigating complex cases involving vulnerable witnesses and children, as well as clients with neurodevelopmental disorders.

    He is adept in the use of technically complex evidence and has prosecuted as led counsel and sole counsel in cases involving Encrochat. His experience includes several document-heavy prosecutions in HSE, SFO and CPS cases.

    Oliver has appeared in both the CACD and High Court as a sole advocate and has acted for Clifford Chance as intervening counsel on behalf of JUSTICE in two recent CCRC referrals.

    He has extensive experience in cases attracting media attention. As both led counsel and sole counsel, he has prosecuted and defended in a range of matters involving celebrities or high-profile figures.

    Oliver is a RASSO-accredited prosecutor, Grade 3 CPS advocate, and is CPS specialist panellist for Serious Crime (Grade 3) and Fraud (Grade 2).

    Notable Cases

    R v JF
    Prosecution of a father for neglecting his young child over several years and intentionally burning her with boiling water, causing life-long scarring and developmental issues.

    R v Alan Harris [Operation Tower 1 and 2]
    Prosecution junior in the high-profile trial of a former criminal solicitor accused of multiple counts of rape and sexual assault of his own clients whilst in Police custody, involving nine complainants over a 17-year indictment period.

    ACCS v Mukesh Valabhji and Sarah René [Operation Black Iron]
    Acted as second junior counsel for the prosecution of former members of the Seychelles Government for extensive corruption, embezzlement and money laundering over a 15-year indictment period.

    R v SP
    Defended a highly autistic teenager accused of physically and sexually assaulting his family members.

    R v Herbert (Rhys)
    Initially instructed to prosecute this celebrity drill artist, better known as Digga D, for breach of his Criminal Behaviour Order. Subsequently acted for the Metropolitan Police Gangs unit in a complex overhaul of the Order, which was one of the first CBOs designed to restrict musical expression to prevent gang violence.

    R v RH
    Defended in complex POCA proceedings following a plea to a major operation to import and then steal cannabis by posing as border enforcement officers, during which the defendant’s benefit was reduced from £1.7m to under £25,000.

    R v AA, AA, FI and AH
    Prosecution junior in a multi-handed case involving an alleged conspiracy to murder during the Notting Hill carnival, during which a firearm was discharged into a crowd.

    R v TP
    Acted for a defendant accused of possession of a firearm, running a defence of duress following his being forced into a local gang.

    Operation Venetic
    Instructed for the NCA in several subsidiary operations arising from the cracking of the Encrochat encrypted device and messaging service, both as led and sole Prosecution counsel, including several multi-handed conspiracies to import Class A drugs.

    R v JF
    Instructed to prosecute a father for wounding his daughter with boiling water and subjecting her to a sustained campaign of child cruelty, which left her with lifelong injuries.

    R v EO
    Defended in a case of robbery with a firearm, running an ID contamination defence.

    R v RB, OK, RR and SS
    Prosecution junior in a multi-handed case involving two separate between conspiracies to murder involving firearms, as part of tit-for-tat violence between rival gangs in Walthamstow.

    R v KK
    Led defence junior for the second defendant, accused of facilitating breaches of UK immigration law by using private aircraft to transport illegal migrants into the UK. 

    R v KA
    Prosecuted a man for a sustained campaign of controlling behaviour and rape against his ex-partner.

    R v SS
    Granted leave and acted for the defendant in the CACD after a refusal by a trial Judge to give an effective good character direction.

    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 'Manchester 10' - an article by Oliver Mosley

      In November 2020, following a series of violent clashes between the M40 and RTD gangs, including the murder of John Soyoye, Ademola Adedeji and nine others were alleged to have conspired in a Telegram chat to attack and kill members of RTD.Our latest arti...

      View article

    • 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 acts in 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.

    Oliver also routinely acts in Local Authority-led matters including prosecutions by Trading Standards. This has recently included illegal waste dumping and the sale of counterfeit goods.

    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