Keith Allen (Harry Marx) is the partner of Tamzin Malleson who played medical examiner Kate Wilding in seasons 14-17 of Midsomer Murders (1997).
Annette Badland and Hannah Waddington were both regular characters in the TV series Ted Lasso.
Lizzy Mccinnery previously appeared in the season 8 episode Sauce for the Goose.
Harriet Thorpe previously appeared in the episode Dance of the Dead.
Hannah Waddington previously played Septa Ulma in Game of thrones that also featured Alfie Allen who is the son of Keith Allen.