Sian Priory

Year of Call: 2016

Sian practices in all areas of extradition and criminal law and has an established practice in professional discipline and regulatory law.

Our specialist clerks can be contacted by email on or phone on 020 7332 5400. To contact our Chambers Director directly in relation to a specific members’ practice, please email

“I have found there to be a real maturity and focus to Sian's day to day way of going about her business. Good communication comes naturally to her and is, in my experience, in excess of expectations at this stage of her career.”

Client Testimonials

“Highly developed written skills…and an unfussy, solution-based approach”

Client Testimonials


Sian specialises in extradition and international law, and maintains an established practice in all areas of criminal law, regulatory law, and professional discipline.

Instructing Solicitors have said:

"Sian’s patience, client care and acting under pressure... filled me with confidence that she is one for the future with difficult clients."

Client Testimonials

"I have been impressed by her confidence, proactivity and professionalism, particularly during an unusual and difficult time during the pandemic."

Client Testimonials

Extradition & International

Sian routinely defends in a wide variety of extradition matters, from first appearance in the Magistrates Court through to appeal in the High Court. She often acts in cases where certificates for counsel are granted owing to the gravity and complexity of the issues and assists as junior counsel in matters well above her call.

Sian has a growing practice in matters involving international law, including making applications to remove INTERPOL Red Notices. She routinely assists Ben Keith on complex international, immigration and public law matters. Most recently, Sian has assisted in a high profile torture case before the African Court of Human Rights and advised on a the high profile extradition matter between the USA and Bahamas.  

Criminal Defence

Sian has a wealth of experience in defence work and has particular experience in defending those with significant mental health issues. Sian’s personability and professionalism have made her adept at communicating with, and successfully representing, the most challenging of clients. 

Criminal Prosecutions - Private & Public

Sian continues to build upon her experience prosecuting in the Crown Court. Sian has prosecuted numerous trials and particularly serious sentences in the Crown Court and has received praise from Judges for her thorough and fair approach. 

Professional Discipline & Regulatory

Sian routinely appears before professional discipline tribunals and the High Court on cases for the NMC, RCN,  HCPC and SWE.  Sian has received praise from High Court Judges for her thorough Skeleton Arguments. 

Following a lengthy secondment with Blake Morgan LLP, preparing cases for the NMC and HCPC, Sian has gained considerable experience in managing a regulatory caseload. Sian’s caseload ranges from minor misconduct and competency matters, to allegations of serious sexual assault. 

Inquests & Inquiries

Sian  accepts instructions in relation to Public Inquiries and Inquests.

Additional Information

Before joining Chambers as a third six pupil, Sian completed pupillage at a leading London Criminal set, specialising in criminal defence work. Prior to this she worked for three years at a leading criminal defence firm, and so brings with her an expertise in defence work.

Sian has spent time volunteering for a number of legal charities including Liberty, Fair Trials and Reprieve. She also spent time working on death row cases at the Louisiana Capital Assistance Centre in New Orleans. 


  • BPP University Law School: BPTC.
  • University of Warwick: LLB.

Professional Panel Appointments

  • Crown Prosecution Service (CPS) Advocates Panel: Level 2: South Eastern Circuit.
  • Government Legal Department Junior Junior Scheme 

Professional Memberships

  • The Honourable Society of the Inner Temple.
  • Women in Criminal Law (WICL).
  • Defence Extradition Lawyers Forum (DELF).
  • Young Fraud Lawyers Association (YFLA).