Seven members of the cast from this episode have appeared in Doctor Who (2005). They are Adjoa Andoh, Jonathan Bailey, Olivia Colman, Arthur Darvill, Eve Myles (also appeared in spin off Torchwood (2006)), Meera Syal and, most famously, David Tennant as the Tenth Doctor and Jodie Whittaker as the Thirteenth Doctor.
David Tennant (Alec Hardy) & Eve Myles (Claire Ripley) also worked together on two episodes of Doctor Who (2005) as The Doctor and Gwen Cooper respectively.
Olivia Colman (Ellie Miller) and Phoebe Waller-Bridge (Abby Thompson) worked together on the series Fleabag (2016).
Charlotte Rampling (Jocelyn Knight) & Marianne Jean-Baptiste (Sharon Bishop) also worked together on Spy Game (2001) as Anne Cathcart & Gladys Jennip respectively.
Arthur Darvill (Rev. Paul Coates) & Shaun Dooley (Ricky Gillespie) also worked together on two episodes of The White Queen (2013) as The Duke of Buckingham & Sir Robert Brackenbury respectively.