Jonathan Grimes


Criminal Litigation

"a very talented lawyer. He's excellent, a well prepared, thoughtful and sophisticated lawyer."

Chambers UK 2020 - A Client's Guide to the UK Legal Profession

"He's fantastic; he's an incredibly smart, very measured and thoughtful lawyer. He zeroes in on the critical part of a case immediately and doesn't get distracted by side issues."

Chambers and Partners, 2019

Jonathan is a criminal lawyer specialising in serious and complex criminal cases. He represents individuals and organisations in all areas of financial services and business crime as well as health and safety and related areas. He also continues to advise in a wide variety of other criminal law matters with a particular emphasis on cases with an international aspect, including war crimes and related work. He provides advice during investigations, attending hundreds of interviews of many different kinds in the course of his career, and is experienced in defending prosecutions brought by a range of law enforcement agencies.

White collar crime

Jonathan has acted in numerous cases involving allegations of financial wrongdoing and has experience of investigations by SFO, FCA, HMRC, CMA, NCA and the police as well as a number of foreign investigative authorities.

He has particular expertise dealing with law enforcement applications that seek to freeze or seize assets, including Account Freezing Orders and other applications made under the Proceeds of Crime Act (POCA). He frequently gives advice on money laundering issues including on the making of suspicious activity reports (SARs). Jonathan is the firm’s Money Laundering Nominated Officer (MLNO).

Jonathan is frequently appointed to act as Independent Legal Advisor (ILA) to individuals interviewed in the course of investigations by their employers or regulators. He also acts for organisations in conducting such investigations.

Health and Safety and Corporate Manslaughter

Jonathan represents companies and individuals during the initial police and Health and Safety Executive investigation, through to the conclusion of cases at inquests or in the criminal courts. He has acted in cases investigated by the Environment Agency, Fire and Rescue Authorities, the Marine and Coastguard Agency, the Civil Aviation Authority and Air Accident Investigation Branch.

International crime

Jonathan provides advice and representation in respect of war crimes and related allegations, including universal jurisdiction matters - allegations which can be investigated and prosecuted in the UK even if neither the alleged offence nor those involved have any connection with the UK. He is past Co-Chair and Advisory Board Member of the IBA War Crimes Committee.

Jonathan joined Kingsley Napley in 2002 and became a partner in 2010.

Notable cases

White collar crime

  • Representation of individuals in NCA cash seizure and Account Freezing Order matters
  • Representing finance director in SFO investigation into government contracts
  • Representing former MD of oil company in relation to Brazilian corruption investigation
  • Advising company wishing to deal with frozen asset
  • Representation of foreign politician in NCA corruption investigation
  • Representation of employee of company in compelled interview conducted by the SFO
  • Representation of company chairman in SFO fraud investigation
  • Advising auction company in relation to AML and POCA matters
  • Representation of bank employee in overseas investigation into market manipulation
  • Representation of bank employee in internal investigation into information supplied to regulators
  • Representation of in-house lawyer in offences against public justice matter
  • Representation of bank employee in HMRC investigation of historic film scheme
  • Representation of fund manager in overseas investigation into market manipulation
  • Representation of employee in SFO compelled interview (using POCA powers)
  • Representation of in-house lawyer in SFO corruption investigation
  • Representation of accountant in FCA investigation into market abuse
  • Representation of bank employees in compelled interviews conducted by the SFO
  • Representation of judge in offences against public justice matter
  • Representation of fund managers in compelled interviews conducted by the FCA
  • Representation of bank employees in investigation into allegations of anti-competitive behaviour
  • Representation of newspaper in relation to criminal allegation
  • Representation of bank employee in Mutual Legal Assistance request from overseas jurisdiction
  • Representation of employees of large multi-national in compelled interviews conducted by the SFO
  • Representation of employee of insurance company in investigation by the Information Commissioner’s Office (ICO)
  • Advising a company on its AML and other reporting obligations upon discovery of suspected employee wrongdoing
  • Advising businesses and individuals on their reporting and other obligations under UK AML law

Health and Safety and other Regulators

  • Representation of prison officer in police investigation following prison death
  • Representation of international construction vehicle manufacturing company following serious accident
  • Representation of business owner in large Trading Standards prosecution (including successful challenge to the imposition of a restraint order)
  • Representation of farmer in animal welfare case
  • Representation of international engineering company following accident in which four people died
  • Representation of numerous employees in various HSE investigations into fatal and non-fatal accidents
  • Representing the “Responsible Person” (under fire regulations) following large fire in retail premises
  • Representation of Chairman and FD of recycling company facing allegations of breaches of environmental law (includes financial restraint proceedings)
  • Representing owner of a hotel in investigation into alleged breaches of fire safety regulations following a fire

International Criminal Law

  • Representation of Colonel Kumar Lama, a Colonel in the Nepalese army on charges of torture, following his arrest in the UK
  • Advising various individuals on risk of prosecution in UK for war crimes and related allegations


  • Representation of numerous individuals facing general criminal allegations including sexual offences and violence (including murder)
  • Advising a school in relation to allegations made against head master
  • Representation of soldiers facing allegations arising from various historic fatal incidents


What Clients and directories say

He has a good ability to think through legal issues in a broad and international way. He doesn't go for the most obvious and domestic point, he looks at the bigger picture and he is very analytical."

Chambers High Net Worth Guide 2020

Jonathan Grimes careful and passionate attention to his clients has made him, slowly but surely, one of the most admired operators in the field. His particular interest in international crime has inspired a huge growth in this area of work within the firm. This requires an usually keen legal mind and a great deal of patience: he has both, and in large measure."

Legal 500 UK 2020

He's very pragmatic and down to earth, but he also has a good grasp of the technical issues that you need to have when dealing with the criminal side of health and safety."

Chambers UK 2020 – A Client’s Guide to the UK Legal Profession

Receives praise for his 'great attention to detail and extremely savvy approach'; he regularly acts for clients in police and HSE investigations, inquests and in the criminal courts."

Legal 500 UK 2019

Internationally recognised as a leading name in the field of corporate investigations, and focuses his impressive practice on financial and white-collar crime matters."

Who's Who Legal, Investigations 2018

The "very impressive" Jonathan Grimes of Kingsley Napley LLP is a criminal lawyer with extensive experience representing clients under investigation and facing prosecution by a number of regulatory authorities with regard to serious and fatal incidents."

Chambers and Partners, 2018

Receives widespread plaudits from peers who praise his expert handling of investigations from a range of regulatory bodies including the SFO, HMRC and FCA."

Who's Who Legal: Business Crime Defence 2018

Jonathan is a diligent and careful lawyer."

Chambers UK, 2018

A sound knowledge’ of health and safety matters, including corporate manslaughter."

Legal 500, 2017

The “terrific” Jonathan Grimes is well known for his strong expertise handling investigations of authorities from the SFO to the FCA and HMRC""

Who's Who Legal, Business Crime Defence 2017

An "extensive knowledge of POCA," and is "a delight to work with." ​"

Chambers UK, 2017

Incredibly committed." "You would feel very reassured if you were a client and Jonathan was supervising."

Chambers and Partners, 2017

...Determined and very hard-working" Jonathan Grimes has experience in universal jurisdiction disputes. Commentators report: "He is fiercely intelligent, and has a concise thought process and impressive knowledge of the law..."  

Chambers UK, A Clients Guide to the UK Legal Profession, 2016

The "excellent"Jonathan Grimes continues to be a "formidable" figure in the proceeds of crime and asset forfeiture space...'"

Chambers UK, A Clients Guide to the UK Legal Profession, 2016

Jonathan Grimes has much experience in acting for major corporate clients in relation to accidental death cases. Clients say he provides "first-class, tactical advice" 

Chambers UK, A Clients Guide to the UK Legal Profession, 2015

...'Sensational' on matters relating to financial services crime and receives widespread praise for his 'impressive depth of expertise' and 'international mindset'."

Who's Who Legal, Business Crime Defence 2015

Jonathan Grimes is "formidably skilful and effective" 

Who's Who Legal, Investigations, 2015

...Brings a level of gravitas to cases...’'      

   Legal 500 UK, 2015

Is held in high esteem by peers, and represents clients in high-profile criminal matters"

Chambers UK, A Clients Guide to the UK Legal Profession, 2014

Jonathan Grimes is widely admired as a 'feisty, sensible,careful and effective solicitor'. Clients include leading companies in the construction sector”

Legal 500 UK, 2014


Professional societies and memberships


Publications, PRess Highlights, Speaking Engagements & Blogs


He has knowledge not just of UK domestic law but also treaties and conventions abroad which makes him unique in his solutions."

Chambers High Net Worth Guide 2020

A very cerebral mind, he continues to impress market sources with his exceptional work on high-profile white-collar investigations."

Who's Who Legal: Investigations, 2020

Is tenacious while at the same time being pragmatic and highly knowledgeable."

Legal 500 UK 2020

He is an all round adviser with second to none technical knowledge, but also a very gracious and caring human being who provides practical advice to his clients."

Chambers UK 2020 – A Client’s Guide to the UK Legal Profession

Jonathan Grimes is utterly exceptional."

Legal 500 UK 2020

He is a determined solicitor who doggedly fights his client's corner."

Chambers UK 2020 – A Client’s Guide to the UK Legal Profession

Receives praise for his great attention to detail and extremely savvy approach."

Legal 500 UK 2019

He fights hard for clients and leaves no stone unturned."

Chambers and Partners, 2018

Realistic, determined, sharp, likeable and accurate."

Legal 500, 2018

Related Services

Bribery and Corruption

We have a long track record of defending corruption investigations for individuals. Our expert lawyers can also advise on internal investigations.

Corporate Manslaughter and Health and Safety Law

The stakes have never been higher for individuals and companies involved in such cases. We provide clear advice on what can be a complex process.

Crimes of Universal Jurisdiction

Travel to the UK can occasionally bring about unexpected consequences. There are a range of criminal charges that can be faced by non UK nationals even though the alleged criminal acts may have occurred abroad and may not involve the UK in any way.

Dawn Raids, Search and Seizure

When subject to a “Dawn Raid”, search and seizure operation and search order you require timely advice. Our specialist lawyers can provide the assistance you require.

Dealing with an Investigation

Under investigation? We ensure you have the specialist, strategic advice to help you manage.

Defending an Allegation

Someone has made an allegation against you. What is the first thing you do?

Financial Services Investigations

We provide intelligent and tactical representation to those involved in an investigation by defending accusations and mitigating risks.

Fraud and Financial Crime

Defending complex white collar cases successfully is what we are known for. The firm has the largest team of specialist criminal lawyers in the UK.


Our team has an established record of representing families, organisations, other interested persons and witnesses at inquests.

Internal Investigations

Corporate clients require sophisticated and sensitive advice when they encounter internal crises which have the potential to escalate.

Insider Dealing

We have extensive experience in representing individuals who have become embroiled in insider dealing investigations.

International Crime and Extradition

Criminal law is increasingly an international concept with cross-border implications. Knowing your rights and options is essential.

Licensing, Hospitality and Leisure

We help companies operating within the Licensed Trade and Leisure Industry to navigate this complex area lawfully and commercially.

Money Laundering

The UK’s anti-money laundering (AML) regime is amongst the most stringent. We represent both individuals and organisations in AML matters.

Mutual Legal Assistance

Robustly defending requests from foreign jurisdictions is not for the faint-hearted or inexperienced. Our lawyers are recognised leaders in the field.

Police Station Representation and Advice

Our team includes specialist police station advisers. We are proactive in achieving the best outcomes for our clients.

Victim of Fraud

Our experienced and empathetic lawyers provide legal advice and guidance to individuals and companies who are victims of crime.


We act for witnesses at all stages in criminal investigations.

Sexual Offences

We deal with the highest profile and most sensitive cases, providing expert advice and support to both individuals and companies.

Construction and Engineering

We specialise in providing transactional construction and engineering advice from project inception through to completion, as well as dispute avoidance advice.

Medical Cannabis: Licensing and Investment

We advise corporates and individuals on all aspects of investing and licensing in cannabis industry.

Proceeds of Crime

Recent years have seen considerable growth in this practice area, following the introduction of new measures designed to tackle illicit finance and the increased attention of enforcement agencies.

Account Freezing and Forfeiture Orders, and Cash Seizure

Tackling illicit finance and the proceeds of crime is a government priority and law enforcement focus.

Money Laundering Regulation and Compliance

Ensuring that the UK financial system is an increasingly hostile environment for illicit finances is a key government priority.

Restraint Orders, Confiscation and Third Party Rights

We advise individuals and corporates in relation to restraint orders and third party applications in respect of property caught by restraint orders.

Unexplained Wealth Orders

UWOs are used by law enforcement agencies to require an individual to prove that a particular asset was obtained through legitimate means.

Extending Moratorium Periods

Another feature of the Proceeds of Crime Act that can have the unwelcome effect of freezing property is the 'moratorium period'

Insight from Jonathan

View all


Health and Safety Sentencing – Three years on and now for the bad news…

SRA to undertake AML audits as enforcers keep focus on “professional enablers”

Fighting financial crime post Brexit: what next?

No deal Brexit and financial crime: proposed regulations published

Working in partnership: a new public/private approach to tackle economic crime

Tackling illicit finance: lawyers under the spotlight

AML: targeting the professional enablers – action not just talk

New sentencing regime for gross negligence manslaughter now in force

Tougher sentences to come for Gross Negligence Manslaughter

Why the International Criminal Court should be supported

Beyond #Brexit: new anti-money laundering regime agreed

Extradition: The Divisional Court has refused to extradite alleged génocidaires to Rwanda--will a domestic prosecution follow?

International Criminal Law – A month in review – July 2017

Proceeds of Crime Act 2002: consultation on revised codes of practice

“School’s out for summer …” The Supreme Court rules on the meaning of ‘regular attendance’ in the term-time holiday case

Arrow Recycling fined in Health and Safety Executive prosecution for cardboard crushing

Court Orders South African Government to Revoke ICC Withdrawal Notice

African Union encourages African nations to revoke jurisdiction of International Criminal Court

Could Trump be prosecuted for torture in UK?

Getting back on the right path - Cameron proposes the greatest reform of prisons since the Victorian era

Politically Exposed Persons - House of Commons debates money laundering rules

Anti-money laundering - speeding up the pace of change

Publicity Order and prison sentence in latest corporate manslaughter case

End of the road for the NCA in NCA v Baker

Unexplained Wealth Orders: An overview of the regime to date

COVID-19: Can you be prosecuted for opening your shop?

Returning to work and COVID-19: Could employers face health and safety prosecutions for infections in the workplace?

Suspicious Activity Report guidance updated in light of anticipated COVID-19 related crime

Account Freezing Orders – Court makes €1.9 million Forfeiture Order

A change of direction in director disqualification for breaches of competition law?

Torture charges dismissed against Agnes Reeves Taylor

Overhaul of SARS regime to be welcomed

SRA AML audits: be prepared

PEPs and anti-money laundering: The FCA issues guidance

EU Anti-Money Laundering rules: tackling risky business and reckless conduct

Anti-Money Laundering: new rules and regulations in play

Genocide – Whether there exists an obligation in the UK to extradite or prosecute in such cases

Health and Safety Sentencing a year on from the new guidelines – What’s changed?

GEO Group UK Ltd and Nestore Primecare Services Ltd face unlimited fines after CPS decision to institute health and safety prosecution

Corporate Criminal Liability – Consultation opened over need for reform

International Bar Association War Crimes Committee Conference – 4 February 2017 – “The World in Crisis”

Universal jurisdiction and the refugee crisis

Recovering the proceeds of crime: the Government responds to MPs recommendations

Increased prosecutions of individuals and more prison sentences in health and safety cases

Anti-Money Laundering: European Commission seeks further change

Construction sector: MPs debate fatal accidents

National Crime Agency reports on UK response to money laundering

Recovering proceeds of crime: MPs question effectiveness of regime

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