Rupert Graves and Martin Freeman appeared on Sherlock (2010).
The 2nd feature where Rupert Graves has played an advisor/counsellor to a monarch - the 1st was The Madness of King George (1994) where Graves plays king's equerry Captain Greville who helps George III through his period of insanity
Christian Coulson, Shirley Henderson, Helen McCrory, and David Bradley appeared in the Harry Potter film franchise.
Helen McCrory and David Bradley both appeared in Harry Potter and the Philosopher's Stone (2001) and they, Shirley Henderson and Christian Coulson all appeared in Harry Potter and the Chamber of Secrets (2002). Both of these Harry Potter films featured Richard Harris as Professor Albus Dumbledore. Richard Harris had earlier played the title character in Cromwell (1970) in which Charles II's father was deposed and then executed