Fiona Robertson

Overview

Recognised by Legal 500 as a leading junior in Crime, Fiona brings extensive trial expertise and a proven track record in defending a wide range of serious offences. Her practice is centred on representing individuals accused of serious and organised crime, including allegations of rape, murder, and complex financial wrongdoing.

Experience

She has notable experience in cases involving young defendants and those with mental health vulnerabilities. Fiona frequently handles matters requiring detailed analysis of expert evidence, such as cell site data, DNA, and medical opinion - and is adept at navigating these technical areas. She also contributed to the field academically as a co-author of the DNA chapter in Rook and Ward on Sexual Offences: Law and Practice.

Fiona is currently as Treasury Counsel. In this role she regularly appears in the Court of Appeal on behalf of HM Attorney General in references under s.36 Criminal Justice Act 1988 (the unduly lenient sentence scheme) in addition to advising on and prosecuting offences of homicide and terrorism.

Notable cases

R v B (2025)

Fiona represented a defendant accused of sexually abusing his ex-girlfriend's child. The case involved careful consideration of sensitive medical records to identify possible reasons for the complainant to have made the allegation despite not seeing the defendant for 8 years. 

R v E and A (2024 and 2025)

Fiona prosecuted a series of 3 trials and re-trials against the defendants who were accused of stealing high value motorbikes and subsequently murdering an associate who the suspected had taken one of the stolen bikes from its hiding place. 

R v Hallam and others (2024 and 2025)

Fiona prosecuted a series of trials involving a conspiracy by Just Stop Oil to cause a public nuisance by climbing gantries over the M25 to bring the motorway to a stand-still. The case resulted in the longest sentences ever imposed on peaceful protestors being handed down and led to a conjoined appeal which considered the relevance of conscientious motivation and Articles 10 and 11 in sentencing non-violent protestors (R v Hallam and others [2025] EWCA Crim 199). Fiona was led by Jocelyn Ledward KC. 

R v G (2023)

Fiona acted alone for the first defendant, a successful drill artist, accused of conspiracy to murder in respect of a gang ‘ride out’ in which 3 innocent members of the public were shot.

R v F (2022)

Fiona represented a serving police officer accused of multiple counts of rape, assault by penetration and sexual assault of a 7-year-old child over several months. The case was tried by a High Court Judge given the nature of the allegations.

NCA v S (2019)

Fiona, led by Leon Kazakos K.C., represented the lead defendant in the largest prosecution brought for the importation and production of anabolic steroids in the UK. In addition to being involved in the production of anabolic steroids in a special fitted laboratory found on his business premises the defendant was accused of being involved in the importation of anabolic steroids from India using complex shipping routes via Singapore, Europe and Ireland to mailboxes in the the UK.

R v L (2019)

Fiona represented an individual charged with murder in relation to a group attack on a gang rival. Following simmering tensions between rival gangs the victim’s group attacked the defendant’s group into a park. The group were quickly outnumbered whereupon the victim was chased down an alleyway and attacked by the defendant’s group armed with golf clubs, bats and machetes. Fiona was also instructed on behalf of 4 of the defendants for proceedings in the Court of Appeal in which the defendants sought to overturn their convictions on the basis of unfairness in the trial process due to lengthy periods of separation during the jury’s deliberations. This case is now a leading authority on case management and acceptable breaks during the trial process (R v Woodward and others [2019] EWCA Crim 1002)