The first series featured an ensemble line-up of guest stars including actors
Robert Lindsay,
Hugh Dennis,
Freddie Fox, and
Joanna Scanlan. The second series, which began in February 2021, was again headed by an all-star guest cast, led by
Rob Brydon, whose role was used to heavily promote the series in the run-up to its broadcast. The final episode of the second series,
The War of the Rose, was made available to watch on
BritBox services outside of the UK. By June 2022, the episode had still not been broadcast in the UK, despite having been released on DVD in Germany, Australia, and the United States. Subsequently, it was announced that the episode would instead air as if it were the third episode of Series 3 in the UK. Due to the casting changes between series, running this episode third in Series 3 would have created a continuity problem, so it was decided to reshoot
James Murray's scenes with
Claire Skinner instead. This means there are two versions of the episode in circulation: the international version with Murray as the Chief Super, and the UK version with Skinner as the Chief Super. Filming on the third series took place in late 2021, with Skinner joining the cast as Chief Superintendent Mary Ormond, following the departure of Murray. Guest stars announced for this series include
Alan Davies,
Sian Phillips,
Paul McGann, and
Kelvin Fletcher. The fourth and final series began filming at the end of June 2023 with Bhavik C. Pankhania joining the cast as DC Lee and guest stars announced for this series include
Lydia Leonard,
Daniel Lapaine,
Ace Bhatti,
John Gordon Sinclair, Dipo Ola,
Toby Stephens and
Pixie Lott. The
title sequence for the show (from Series 2) features a question mark (which transforms into the title's
ampersand), referencing the iconic overhead view of
Royal Crescent and
The Circus, two
listed structures in Bath that are frequently shown on screen. ==Cast==