Rhiannon Sadler


Rhiannon is a dynamic advocate with broad experience in criminal, court martial and regulatory law. A persuasive negotiator with exceptional communication skills, she is analytical, pragmatic and personable – and puts her heart and soul into cases.

She has been recommended in Chambers & Partners every year since 2009 – as well as in Legal 500.

Background and expertise

Rhiannon is a Grade 4 prosecutor, regularly appearing at Crown courts to prosecute complex cases including conspiracies, serious violent and sexual offences, and fraud.

Her defence practice has taken Rhiannon all over the country. She has successfully defended in a succession of ‘multi-handed’ drugs cases (including conspiracy to supply cocaine; an international plot to import drugs from the Caribbean; and conspiracy to cultivate cannabis).

Other notable successful defence instructions have included trials relating to honour-based kidnap and false imprisonment; cigarette smuggling; and firearms.

Rhiannon is adept at dealing with cases with vast amounts of documentation (including VHCC) and is regularly instructed in matters that involve highly technical evidential, legal, or jurisdictional angles.

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Notable cases

R v A & others, 2019

Junior Counsel for the Crown. The defendants laundered £250,000 from the fraudulent sale of a property.  The monies were transferred from the conveyancing solicitors to companies as well as individuals, some of whom were duped whilst others recruited to make a profit. Three defendants were convicted, another had previously pleaded and turned QE.    St. Albans Crown Court.

R v D and others, 2019

Junior counsel for the alleged stabber. The prosecution alleged that this Defendant, along with 8 co-defendants, was responsible for the murder of one victim and the wounding with intent of another during a large-scale and overwhelming attack involving knives, a large axe and hammers on 11th December 2018.

The Crown stated “Even by modern standards, the scale of the violence is terrifying and out of all proportion to the root cause of the trouble, namely that GH had broken up her relationship with DG”.

The defendant was acquitted of murder but convicted of manslaughter and sentenced to 16 years. Central Criminal Court.

R v L and others, 2019

Led junior for first defendant of four. Secured acquittals for the defendant who was a former police officer and a former army officer, with a keen interest in firearms. He was alleged to have stolen weapons, and parts of weapons - including SA80 rifles, sniper rifles and Lee Enfield rifles - belonging to the Army during his time at the Small Arms School Core Collection in Warminster. The value of the thefts was alleged to be in excess of £100,000.

R v B and others, 2018

Led junior for defence. The defendant was the second of three defendants (one of whom was a serving UK Border Agency Officer) who faced an indictment alleging importation of cocaine, heroin and prohibited firearms.The defendants were part of a much larger network of criminals who conspired to bring in vast quantities of narcotics and dangerous weaponry in from Europe and the case arose from a joint surveillance operation undertaken by the Metropolitan Police Service, The National Crime Agency and the French Police. Isleworth Crown Court.

R v M and others, 2018

Led junior for defence. 6-handed conspiracy to commit fraud by false representation whereby the Directors of a company fraudulently obtained millions of pounds in funding from further education training colleges. Two of the defendants  were ex professional footballers and utilised their contacts in this industry. The prosecution claimed that the value of the fraud totalled £5,090,876.50. Souhwark Crown Court.

R v T and others, 2016-2017

Junior counsel for defence in 40-day, seven-handed trial for conspiracy to facilitate the unlawful immigration of non-EU citizens from the UK to France (reverse people trafficking) – arising from an undercover operation by journalists working for the Sun. Isleworth Crown Court

Read more Notable cases

Other Activities and Interests

  • Speaker for schools

Professional commentary and attribution

“Regularly instructed to prosecute cases concerning fraud, as well as serious sexual and violent offences. She also defends a wide variety of cases, including those involving child sexual abuse and multi-handed drugs conspiracies.
"She is very calm and measured, and she shows very good judgement."
"Rhiannon is a dynamic prosecution and defence advocate with broad experience at all levels of criminal law. She has an outstanding reputation, a strong work ethic and excellent organisational skills."
"She is a highly regarded junior and has been led in a multitude of cases including a 3-month long conspiracy to steal, a conspiracy to defraud the Secretary of State involving international visa fraud, as well as murder, both prosecuting and defending."
"She is a persuasive negotiator with exceptional communication skills and experience in handling highly sensitive cases. She has a keen interest in honour based crimes and successfully secured an acquittal for a father accused of honour based kidnap and false imprisonment."
"Rhiannon is lauded for her willingness to go the extra mile and delivery at the highest of standards. She is a Grade 3 prosecutor and routinely briefed in both London and the Provinces. She has a proven ability to adapt quickly to new and complex environments and thrives under pressure."

Chambers UK, 2018

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PROFILE: Rhiannon Sadler

Chambers UK, 2015 and 2016 Chambers UK, 2021

Year called




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Confiscation / POCA

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Financial Crime

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Fraud, Bribery & Corruption

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Serious Crime

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Sexual offences


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Regulatory / Disciplinary


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Road Traffic

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Road traffic

Direct access



020 7489 2727


BVC, The College of Law, London, 2003–04

LLB (Hons) in Law, Kingston University 2000–03


CBA, South Eastern circuit, Sussex Bar Mess, North London Bar Mess


CPS Panel (Grade 4)

Association of Military Court Advocates – committee member


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