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 3 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; conspiracy to supply cannabis, involving an international plot to import goods from the Caribbean; and conspiracy to cultivate cannabis.

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

Rhiannon is a highly skilled junior and has been led in cases at both the Court of Appeal and Crown Court – including murder; conspiracy to defraud; conspiracy to steal and handle stolen goods; and conspiracy to traffic people.

She conducts her practice with enthusiasm, professionalism and skill – irrespective of case, client or location.

Notable cases

R v Smith, 2011
EWCA Crim 1098 Defence appeal against conviction. Appeal allowed on the basis of misdirection regarding adverse inferences. Conviction quashed.
R v Rogers, 2013
EWCA Crim 2406 Respondent in appeal against conviction. Conviction upheld.

Read more Notable cases

R v Balvinder Singh, 2013
Secured an acquittal for a Sikh father accused of an honour-based kidnap and false imprisonment involving his daughter’s secret boyfriend.
R v Vitalius Lapinskas and others

Junior counsel for Crown in five-handed trial for conspiracy to steal and conspiracy to handle cars and parts worth in excess of £500,000. Case involved extensive covert surveillance and expert evidence; Rhiannon was commended for preparation of extensive schedules for use in presenting the case to the jury.

R v McDonagh and others, 2009
Led junior in 12-week, 10-handed conspiracy trial at Winchester Crown Court, which resulted in an acquittal.
R v Abdul Tafader and others, 2016-17
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 – arising from an undercover operation by journalists working for the Sun.
R v Bartosz Lewicki, 2017
Defence counsel in four-handed trial for cigarette smuggling, involving a client who instructed counsel in his absence for medical reasons. Acquitted of conspiracy to import cigarettes. Jury convicted of a single substantive.

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

“A very capable advocate with a mixed criminal practice…hard-working, diligent and very intelligent.”

Chambers UK, 2015 and 2016

Year called



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Financial Crime

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Fraud, Bribery & Corruption

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Regulatory / Disciplinary

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


Grade 3 prosecutor

Association of Military Court Advocates – committee member

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