Harry Perkin has a broad practice across Chambers’ main areas of expertise, with a particular emphasis on extradition, regulatory matters, professional discipline and crime.

Harry is currently seconded to the Crown Prosecution Service Extradition Unit. He is due to return to Chambers in February 2026.

He was appointed to Panel C of the Regulatory Board’s list of Specialist Regulatory Advocates in 2025.

Legal Expertise

Extradition, INTERPOL & Mutual Legal Assistance overview

Harry is presently seconded to the CPS Extradition Unit as a Senior Crown Prosecutor. He regularly represents Issuing Judicial Authorities at Westminster Magistrate’ Court and the High Court.

Harry has significant experience dealing with complex legal issues and expert evidence. He also has experience dealing with thematic challenges regarding prison overcrowding and inter-prisoner violence. Harry has represented requesting states in Part II proceedings at the High Court in relation to bail applications.

Harry has also represented Requested Persons in Part I cases. Harry is experienced in presenting Article 8 arguments compellingly.

Notable Extradition, INTERPOL & Mutual Legal Assistance cases

Romania v R (2024)

Represented the RP in a case raising Section 2, Section 10 and Article 8 ECHR.

Regulatory and Licensing Law overview

Harry has assisted other members of Chambers in relation to Environment Agency prosecutions against a recycling company and water company. Harry has also assisted other members of Chambers in advising the Office of Rail and Road in relation to a criminal investigation arising from the death of an employee of a British train operating company. He has also assisted a member of Chambers in relation to restocking provisions under the Forestry Act 1967, and liability to mandatory exclusion under the Procurement Act 2023.

Harry has prosecuted cases in both the Magistrates’ Court and Crown Court on behalf of local authorities concerning the Consumer Protection from Unfair Trading Regulations 2008 and EPA 1990.

Harry has appeared for Transport for London in licensing appeals in the Magistrates’ Court and Crown Court.

Harry has delivered seminars on ‘Legal Professional Privilege and Internal Investigations’ with Saba Naqshbandi KC and Amanda Pinto KC. Recent instructions include assisting a KC in an internal investigation for a firm of solicitors.

Professional Discipline overview

Nursing and Midwifery Council

Harry completed a secondment with the Nursing and Midwifery Council in 2025. He represented the NMC in numerous incorrect entry/fraudulent entry cases and Registration appeals which related to fraudulent proxy test-taking in Yunnik, Nigeria. Harry regularly questioned and made submissions on expert evidence concerning statistical analysis.

Teachers Regulation Agency

Harry has presented cases for the TRA, including in a cases involving alleged sexually motivated behaviour and dishonesty.

Harry has also presented cases on behalf of the Education Workforce Council.

Health and Care Professions Council

Harry has acted as the Presenting Officer for the HCPC in sanctions hearings.

General Dental Council

Harry has acted as the Presenting Officer for the GDC in Interim Order hearings, and review of conditions hearings.

Crime overview

Harry represents defendants in the Magistrates’ Court and Crown Court. He has defended in cases involving a range of offences including assault, battery, theft, criminal damage, public disorder offences, malicious communications, motoring offences and criminal offences arising from protest-related activity.

Harry has experience dealing with vulnerable defendants. He also has made representations which have led to proceedings being discontinued where the defendant had complex mental health issues.

Harry has prosecuted for the Crown Prosecution Service.

Notable Crime cases

R v E

Represented a Defendant in the Crown Court charged with offences contrary to the Identity Documents Act 2010.

R v H

Represented a Defendant in the Crown Court whose dog bit a child in the face. The Defendant received a discharge.

R v A

Following Harry’s written submissions, the CPS discontinued proceedings against a Defendant who caused damage to an MP’s constituency office.

R v T

Represented a police officer acquitted of sexual assault.

R v L

Represented a defendant in the Crown Court who was accused of racially aggravated harassment.

R v F

Represented a defendant acquitted of 5 charges relating to harassment and breaches of non-molestation orders.

Civil & Quasi-Criminal Matters overview

Harry is frequently instructed by the Metropolitan Police Service both to advise on and appear in applications for civil preventative orders, including:

  • Stalking Protection Orders
  • Sexual Harm Prevention Orders
  • Sexual Risk Orders
  • Closure Orders
  • Gang injunctions
  • Dog Control Orders

Harry has special experience dealing with sexual risk orders and sexual harm prevention orders involving mental health issues.

Harry also acts for Respondents in civil order applications, including stalking protection orders, dog destruction orders and football banning orders.

Notable Civil & Quasi-Criminal Matters cases

Commissioner of Police v S

Acted for the Respondent and successfully resisted an application for an interim Stalking Protection Order.

Commissioner of Police v F

Acted for the Commissioner of Police in obtaining a sexual risk order in respect of a person who was accused of over 10 rapes and sexual offences committed against women and girls with mental disorders and/or learning difficulties.

Financial Crime and Proceeds of Crime overview

Harry regularly appears in and advises on matters across the spectrum of financial crime and POCA. Recent instructions including cash forfeiture, account forfeiture and account freezing order applications by the Metropolitan Police Service.

Notable Financial Crime and Proceeds of Crime cases

MPS v C

Advised and represented the Commissioner in relation to a 6-figure account forfeiture application.

Public Law overview

Harry has experience of a range of public law matters and is particular interested in cases in which public law and crime intersect. Harry has advised and represented parties in proceedings before the Investigatory Powers Tribunal.

Notable Public Law cases

MPS v G

Harry represented the Commissioner in proceedings before the Investigatory Powers Tribunal regarding Section 49 RIPA.

  • Criminal Bar Association
  • Young Fraud Lawyers’ Association
  • Bar Vocational Studies Course (Distinction) (2022)
  • Graduate Diploma in Law (Distinction) (2021)
  • Yale University, MA in History (Honors) (2020)
  • Clare College, University of Cambridge, BA in History (Double Starred First) (2018)

Awards

  • Princess Royal Scholarship, Inner Temple (2021-2022)
  • Exhibition Award, Inner Temple (2020-2021)
  • The City Law School Scholarship for Academic Excellence (2020)
  • Paul Mellon Fellowship, Yale University (2018-2020)
  • Richard U Light Fellowship at the American Institute of Indian Studies (2019)
  • Clare College Honorary Scholar and College Prize (2018)
  • Crown Prosecution Service (General Crime) Level 1

I, Harry Perkin, am a data controller and can be contacted at 3 Raymond Buildings, Gray’s Inn, London WC1R 5BH or by telephone on 020 7400 6400 or by email at harry.perkin@3rblaw.com.  My Data Protection Policy can be found here.

All personal data that I process is for the purposes of providing legal services, conducting conflict-checks, marketing, defending potential complaints, legal proceedings or fee disputes, keeping anti-money laundering records, training other barristers and pupils and when providing work-shadowing opportunities, and/or exercising a right to a lien.  The types of data I process vary upon the nature of the legal matter in relation to which I am engaged to advise, but can include names, contact details, biographic details and ‘special category personal data’ (such as details of racial or ethnic origin, political opinions, religious or philosophical beliefs, health, sex life and criminal convictions and proceedings).

Depending upon the circumstances of the case, the legal bases upon which I process personal data are (i) the performance of a contract to which the data subject is a party or in order to take steps at the request of the data subject prior to entering into a contract, (ii) the processing is necessary to comply with legal obligations to which I am subject, or (iii) the processing is necessary for the legitimate interests set out above, except where such interests are overridden by the interests or fundamental rights and freedoms of the data subjects which require protection of personal data, in particular where the data subject is a child.  When I rely on (iii) legitimate interests, my ‘Legitimate Interests Assessment’ can be found here.  When I process data which has not been obtained directly from the data subject (e.g. personal data contained in evidential materials), it will have been supplied to me as part of my instructions in circumstances covered by legal professional privilege.

Depending upon the circumstances of the case, I may share the personal data with:

  1. my Chambers, which supplies professional and administrative support to my practice;
  2. Courts and other tribunals to whom documents are presented;
  3. my lay and professional clients;
  4. potential witnesses, in particular experts, and friends or family of the data subject;
  5. solicitors, barristers, pupils, mini pupils and other legal representatives;
  6. ombudsmen and regulatory authorities;
  7. current, past or prospective employers;
  8. education and examining bodies;
  9. business associates, professional advisers and trade bodies.

I retain personal data for no longer than 7 years after the case has come to an end or as otherwise required by law.

I do not intend to transfer data to any country which is not either within the European Union, or otherwise permitted by UK data protection legislation.

Under the UK GDPR, data subjects whose personal data I process have the right to request from me access to, and rectification or erasure of, their personal data, the right to the restriction of processing concerning them, the right to object to processing as well as the right to data portability.  Data subjects also have the right to lodge a complaint with the Information Commissioner’s Office (ico.org.uk).

In cases where there is a contract between me and the data subject, the provision of personal data is a contractual requirement and the data subject is obliged to provide the personal data in order that I can supply legal services.  A failure to provide such data may mean that I will not be able to provide those legal services.

Rev 2.1 29.09.2023

Data Protection Policy

Legitimate Interests Assessment

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