The office used in season 1 is 90 Holborn, former offices of Olswang LLP, a law firm specialising in media, technology, and television work.
Filmed in the IPCC building in Holborn.
Season 2 was filmed at 1 London Wall Place in August 2021.
Nicola Walker (Hannah) and Deborah Findlay (Ruth) also worked together on Episode #1.5 (1999) of The Last Train (1999) as Harriet and Gillian.