Suggestions by @marswid

Prince Harry, Duke of Sussex

as Jason Ritchie Ron's son. An ex-boxer. Aka: Jr Ewing. in BBC The Thursday Murder Club

Rupert Grint

as Jason Ritchie Ron's son. An ex-boxer. Aka: Jr Ewing. in BBC The Thursday Murder Club

Ralph Fiennes

as Bernard Cottle Joyce's friend. A professor. in BBC The Thursday Murder Club

Brendan Gleeson

as Ron, a former trade unionist; in BBC The Thursday Murder Club

Naomi Harris

as Donna De Freitas A policewoman who liked to chase serial killers. in BBC The Thursday Murder Club

John Krasinski

as Bogdan Jankowski The man to whom Ian owes money. in BBC The Thursday Murder Club

Sally Field

as Joyce, a former nurse; and Ibrahim, a former psychiatrist in BBC The Thursday Murder Club

Ian McKellen

as Gerry Meadowcroft Joyce's late husband. in BBC The Thursday Murder Club

Patrick Doyle

as Composer in BBC The Thursday Murder Club

Kenneth Branagh

as Director in BBC The Thursday Murder Club

Sean Connery

as Matthew Mackie The reverend. in BBC The Thursday Murder Club