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 a regulatory practice, primarily focusing on health care and education regulation. She frequently receives briefs to appear as a case presenter for both Social Work England (SWE) and the Nursing and Midwifery Council (NMC). Katie has dealt with a range of cases including cases of misconduct, lack of competence and health. As well as representing the regulators Katie has experience of representing individuals appearing before their regulator. She has advised and represented clients before the General Medical Council (GMC), the Health and Care Professions Council (HCPC) and Social Work England (SWE).

Additionally, Katie 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 is on the CPS Extradition Panel at Level 2. She has represented Issuing Judicial Authorities (IJA’s) at extradition hearings and at the High Court.

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

BHA v JF, 2021-2022

Katie, led by Jane Bickerstaff QC of Chambers, prosecuted the first Safeguarding case brought by the British Horseracing Authority (BHA). The trainer, JF, was found to have breached the BHA’s safeguarding rules, aimed at protecting young persons and adults at risk. JF was permanently excluded from racing for a period of seven years. The matter was reported in the press here.

R v PT, 2021-2022

Katie, led by Katrina Charles of Chambers, prosecuted a three-month case where the defendant was convicted of 11 counts of fraud. The defendant had offered to value antiques – usually owned by elderly or vulnerable individuals – and instead treated the items as his own, either storing or selling them. The matter was reported in the press here. Isleworth Crown Court.

R v BB, 2022

Katie defended an individual charged with possession of a shotgun and ammunition, which carries a mandatory minimum sentence of 5 years. In addition to the firearms offences Katie’s client had already pleaded guilty to being in possession of cannabis with intent to supply it to others. Katie’s client pleaded guilty to the firearms offences and following mitigation he was sentenced to the minimum term of 5 years, with the sentence for the drugs matter to run concurrently. St. Albans Crown Court.

R v JH and others, 2022

Katie prosecuted a three-handed case involving a ‘crime spree’ of offences committed in June 2019, including a night-time dwelling burglary. Pleas were entered on the morning of trial and the first defendant was sentenced to 4 years 6 months imprisonment, the second defendant was sentenced to 3 years imprisonment and the third defendant received a suspended sentence. Aylesbury Crown Court.

R v BJ and others, 2021 (on-going)

Katie is currently being led by Corinne Bramwell of chambers in a multi-handed drugs conspiracy case involving EncroChat evidence. Snaresbrook Crown Court.

R v ME and others, 2021

Katie, led by Tessa Shroff of chambers, prosecuted a multi-handed conspiracy to rob case. The case involved a group of males breaking into a property in the middle of the night and demanding money from the occupants. One of the occupants of the property was beaten and another was stabbed. The first defendant pleaded guilty on day 3 of the trial and the other defendants were all convicted by the jury. Basildon Crown Court.

HCPC v IY, 2021

Katie represented a paramedic who was accused of mismanaging medication at a large event. After representations were made by Katie the HCPC amended the charges to reflect that this was an omission, rather than a wilful act. On this basis the charges were admitted, and Katie persuaded the panel not to find current impairment.

SWE v RF, 2021

Katie represented a social worker who admitted that she had disclosed confidential information about children without a professional reason to do so. After hearing evidence from the social worker, her manager and submissions from Katie the panel found that the social worker’s fitness to practice was not currently impaired.

R v B, 2021

Katie represented a youth charged with a knife point robbery at trial. The allegation was that threats had been made with a knife in order to steal a designer coat. The complainants’ statements were admitted as hearsay. The jury returned a unanimous not guilty verdict in respect of Katie’s client.

NMC v JB, 2021

Katie represented the NMC in a case involving allegations that nurse JB did not intervene when detention officers were choking a detainee at Brook House Immigration Removal Centre. The allegations came to light due to covert filming for BBC Panorama. The panel found current impairment and struck JB off the professional register.

R v KH and RO’D, 2021

Katie prosecuted two men charged with the robbery of a taxi driver. The incident was caught on dash-cam footage where the men could be seen to use a mobile ‘phone charging cable to strangle the driver. The defendants were sentenced to 10 years imprisonment and 11 years, 4 months’ imprisonment respectively. The matter was reported in the press here.

Basildon Crown Court.

R v B and B, 2020.

Katie represented two brothers (aged 16 and 17) who were both charged with causing grievous bodily harm with intent (s18), following a stabbing.

Following representations from Katie the Crown accepted a plea to s20 from the younger brother and he was sentenced to a Youth Rehabilitation Order with intensive supervision and surveillance.

St. Albans Crown Court.

R v RH, 2020

Katie represented a client charged with breaching a restraining order. She submitted written representations to the Crown stating that prosecution was not in the public interest due to – in part - the delays caused by Covid-19. Katie’s representations persuaded the Crown to drop the charges against her client.

Croydon Crown Court.

NMC v KW, 2020

Katie was instructed by the NMC mid-way through a substantive hearing which ran for over 10 weeks in total. The charges related to a range of misconduct matters alleged against an independent midwife. Katie was required to review complex medical evidence and cross-examine the defence expert at length.

R v GN, 2020

Katie represented a client who was charged with cultivation of cannabis and abstracting electricity. Following representations the Crown did not pursue the abstracting electricity charge and the client received 8 months imprisonment for the cultivation of cannabis, which he had pleaded guilty to. Snaresbrook Crown Court.

Hungary v LF, 2020

Katie was instructed by the CPS on behalf of the Hungarian authorities. This case concerned a warrant for seven different offences including violation of lease terms and accounting omissions. The issues raised included dual criminality. Following submissions from the IJA to this effect the court discharged the requested person in respect of two of the offences (noting that his speciality would be protected in respect of the discharged matters by the operation of Article 27 of the Framework Decision) and ordered extradition in respect of the remaining matters.

Romania v LN, 2020

Katie was instructed by the CPS on behalf of the Romanian authorities. The requested person was tried in his absence in Romania and he asserted that he was unaware of the proceedings against him. The issue in the case therefore largely centred around the requested person’s fugitive status. Following submissions the Judge found the requested person to be a fugitive and ordered his extradition.

R v CT, 2019

Katie represented a client who was facing firearms and drugs charges. He was charged with an offence under the Firearms Act which carries a mandatory minimum 5 year prison sentence and possession of Class B drugs with intent to supply (PWITS). Consequently, the client was facing an immediate prison sentence of several years. At court the Crown accepted pleas to a lesser offence under the Firearms Act and simple possession of the drugs. Katie was then able to persuade the Judge to impose a total sentence of 7 months imprisonment suspended for 18 months. Isleworth Crown Court.

R v UH, 2019

Katie prosecuted a Newton Hearing in respect of a child abduction matter. The issue in dispute was whether the 13 year old complainant had been threatened during the time he had been abducted. The Judge found that threats had been made and sentenced the defendant to 28 months imprisonment. Snaresbrook Crown Court.

Read more Notable cases

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PROFILE: Katie Mustard

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Regulatory / Disciplinary

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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


CPS Panel (Grade 2)

CPS Extradition List (Grade 2)

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