Before completing her Bar training course, in 1988 Lambert was awarded a grant by the Inner Temple of £3.500 and a Yarbrough-Anderson scholarship of £300 in August 1988. (£8,409 in 2019).[4]
After completing her Pupillage, Lambert was called to the Bar by Inner Temple in 1988 and began her tenancy at 6 Pump Court Chambers. She later moved to '1 Crown Office Row' where she remained until taking up office.[5] She was appointed King's Counsel in 2009.[6]
In 2012 Lambert was appointed as Lead Counsel to the Dame Janet Smith Review into the culture and practices of the BBC relating to the sexual abuse of Jimmy Savile.[7] Between 2014 and 2016, Lambert acted as lead counsel for the coroner in the Hillsborough disaster inquest.[8] She remarked that the inquest as the most memorable moment in her career.[3][9]
“During my questioning of the match commander, David Duckenfield, he admitted that he lied about fans forcing the exit gate to gain entry to the stadium: the court — packed with the relatives of those who died — fell completely silent.”[10]
Lambert presided over the trial of Savannah Brockhill and Frankie Smith, for the murder of Star Hobson.[14] She also presided over the 2023 trial of David Boyd, for the murder of Nikki Allan, that had remained unsolved since 1992.[15]