“Quite simply, she is at the top of her field. Thorough, tenacious and very incisive – she has a pedigree that few can match” 
John Charles Rees QC


Siân is a Regulatory and Corporate Crime Solicitor with over 10 years post qualification experience.

She was previously a Senior Associate in the Regulatory team at a leading law firm. She has extensive experience in dealing with cases investigated or prosecuted by the Serious Fraud Office (SFO), Office of Fair Trading (OFT) HM Revenue and Customs (HMRC) and the Financial Services Authority. She has acted in both private and publicly funded cases and is recognised as a Grade A Supervisor for VHCC cases.

Siân advises individuals and corporate clients in relation to all types of tax disputes with HMRC, including freezing orders, and has particular experience in relation to VAT litigation within the tax tribunals. She also has experience of judicial reviews in the administrative court on a variety of tax matters.

Siân has experience of advising corporations in relation to both investigations by regulators and internal investigations. She also provides advice and training on compliance issues relating to anti-bribery and corruption, anti -money laundering legislation and competition law.

Siân has worked on several notable cases including:

  • Operation Venison – a £100 million MTIC fraud Prosecution which collapsed following a successful abuse of process argument.
  • R v H and W – SFO Prosecution against two senior Solicitors at a leading international law firm. The charges of perjury and conspiracy to pervert the course of justice arose from their work on a commercial litigation case. All charges were dismissed following a successful application.
  • Several HMRC MTIC Prosecutions including Operations Devout, Euripus and Inertia.
  • Operation Holbein – SFO investigation into alleged criminal cartel activity in the pharmaceutical industry.
  • Operation Steamroller – US$100 million boiler-room fraud.
  • R v G & others – flagship FSA Prosecution of four former directors of iSOFT for conspiring to make misleading statements to the market. Trial ultimately collapsed and the client was acquitted.