Katie Mustard


Katie prosecutes and defends in the Crown Court and youth courts. In 2018, she was seconded to CPS London where she litigated all cases across the criminal spectrum including sexual offences, gang-related offences and fraud. She is a CPS panel Advocate at Level 2.

Katie also has experience of investigatory work and public inquiry work. She successfully completed an ‘Investigative Interview’ course with Intersol Global in 2017 – this has assisted her with undertaking the early stages of investigation in respect of private prosecutions. She has also appeared in cases prosecuted by charitable organisations, including the RSPCA.

Katie also has a regulatory practice, primarily focusing on health care and education regulation. She frequently receives briefs to appear as a case presenter for the Nursing and Midwifery Council (NMC), including cases of misconduct, lack of competence and health.

Background and expertise

Prior to joining chambers, Katie worked within the regulatory department at Kingsley Napley. She undertook work for both regulators and individual registrants.

Katie has completed the vulnerable witness training course through Lincoln’s Inn. She is regularly instructed in matters involving both vulnerable witnesses and vulnerable defendants.

Notable cases

NMC v RB, 2019

Katie presented a case where the Registrant’s omissions related to a particularly vulnerable patient, who sadly died. Following a 7 day hearing, which involved evidential issues regarding the Coroner’s inquest, the panel found all the charges proved and cautioned the Registrant.

R v FR, 2019

Katie prosecuted an extreme pornography trial where the defendant was accused of possessing a number of videos depicting sexual conduct with animals. Maidstone Crown Court.

R v DON, 2019

Katie prosecuted a man who stole nearly £10,000 from his mother whilst she was unwell and in hospital. He offered a plea on the day of trial and was sentenced to 15 months custody. Woolwich Crown Court.

NMC v JD, 2018

Katie presented a case where the Registrant was accused of clinical misconduct as well as stealing a blue disabled badge permit and using this fraudulently. Following a 7 day hearing the panel found the charges proved and struck the Registrant off the register.

R v AH, 2018

Katie secured a conviction for ABH following an incident where the defendant had assaulted a local resident who had questioned why he was loitering in the bin sheds at his block of flats. Inner London Crown Court.

R v HL, 2018

Katie represented a man accused of permitting his property to be used to cultivate cannabis. He was charged alongside his wife and son. Following representations from the defence the Crown offered no evidence against Katie’s client and his wife. Woolwich Crown Court.

R v BT

Katie represented an individual who was accused of possessing a bladed article. The charge was his second such offence and, consequently, he was facing the mandatory minimum six month sentence if convicted. Katie’s speech to the jury focused on the ambiguity of the DNA evidence and forensics. The jury returned a unanimous not guilty verdict. Cambridge Crown Court.

R v UN

Katie successfully defended a young client accused of ABH who was jointly charged with others. At trial Katie made an application to adduce the complainant’s bad character and this was admitted into evidence. She then cross-examined the complainant about the inconsistencies in his evidence and he accepted that his evidence differed from the account which he gave to the police. Oxford Youth Court.

R v ES

Following guilty pleas to a number of offences which were committed in the course of a suspended sentence Katie successfully persuaded the court to only activate the suspended sentence in part. Katie’s submissions had the effect of reducing a likely sentence of over two years down to a sentence of 18 months. Crown Court at Chelmsford.

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PROFILE: Katie Mustard

Year called




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Regulatory / Disciplinary

Road Traffic

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Road traffic


020 7489 2727


BPP (2014) - Bar Professional Training Course – Outstanding

Birmingham City University (2012) – LLB Law Hons – First-Class with Honours


The Honourable Society of the Inner Temple


Grade 2 prosecutor

CPS Extradition List (grade 1)

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