Jonathan Grimes


Criminal Litigation

"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 2016

Jonathan is a criminal lawyer specialising in serious and complex criminal cases. His practice includes 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.

In the area of white collar crime he has considerable expertise in cases involving alleged financial wrongdoing with experience of investigations by SFO, FCA, HMRC, BIS as well as a number of foreign investigative authorities. He frequently acts in the role of Independent Legal Advisor (ILA) to individuals interviewed in the course of investigations by their employers or regulators. He has acted in this capacity for more than 40 individuals in the past three years, the majority being bank employees. Jonathan is the firm’s Money Laundering Nominated Officer.

In relation to 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 also acts 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.

Jonathan provides advice and representation in respect of war crimes and related allegations, which can be investigated and prosecuted in the UK under the principles of universal jurisdiction even if neither the alleged offence nor those involved have any connection with the UK. He is the immediate 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.

Recent cases

Business crime

  • Representation of company chairman in SFO investigation
  • Representation of bank employees in compelled interviews conducted by the SFO
  • 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 traders and other bank employees in company interviews and interviews with foreign regulators into alleged wrongdoing in FX trading
  • 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 finance director in SFO corruption investigation
  • 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 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
  • Advising witnesses in the Baha Mousa Public Inquiry into mistreatment of prisoners in Iraq


  • Representation of numerous individuals facing general criminal allegations including sexual offences and violence (including murder)
  • Representation of soldiers facing allegations arising from various historic fatal incidents.


Professional societies and memberships


Recent Articles, bulletins, and press comment


"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

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: Analysis

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

Chambers UK, 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

Crime:  “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

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

   Legal 500 UK, 2015


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, 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 regime is amongst the most stringent. Tackling laundering of criminal proceeds is a key priority for the Government.

Mutual Legal Assistance

Robustly defending requests from foreign jurisdictions is not for the faint-hearted, nor for the inexperienced. Our lawyers have unparalleled experience and 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.


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.

Comment from Jonathan

View all


“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

Corporate manslaughter case offers lessons for other SMEs

Financial services: Penalties for manipulation in five additional benchmarks – Consultation announced

Gold Fix Manipulation – FCA says it is possible but “no clear evidence”

Why are war crimes relevant to English criminal lawyers?

Corporate Criminal Liability in the UK – the Government takes up the call for change

Rare HSE prosecution of NHS trust over clinical failing

The dubious merits of hiring a former prosecutor

Police Station Advice – predicting the application of “Judgement and Discretion”

The Draft Deregulation Bill – Reduced Health and Safety burden for the self-employed?

Corporate Criminal Liability - Elephant in the room spotted

Rape: deception as to intention vitiates consent

The Corporate Manslaughter Act five years on - are the flood gates about to open?

Corporate manslaughter conviction for Lion Steel Limited

Bring back the stocks! The government’s latest populist idea for criminal justice

Corporate manslaughter – fifty cases currently under review

Corporate manslaughter – Four years on and only a single conviction

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

New Sentencing Health and Safety and Corporate Manslaughter Sentencing Guidelines - Massive increase in fines for medium and large companies expected

Risky business: Money laundering and the City

Sir Keir Starmer’s Victims of Crime Bill introduced to Parliament

International Criminal Law – A month in review – July 2015

First DPA now eagerly awaited

Intoxication and consent in rape allegations – a double standard?

Fourth statutory corporate manslaughter conviction – are trends emerging?

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+44 (0)20 7814 1234

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