He had leading roles in `` Lytton 's Diary '' and `` Goodnight Sweetheart '' , as well as memorable roles in Dennis Potter 's `` The Singing Detective '' and Andrew Davies 's adaptation of `` To Play the King '' .
He was known for his roles in `` Lytton 's Diary '' and `` Goodnight Sweetheart '' , as well as memorable roles in Dennis Potter 's `` The Singing Detective '' and Andrew Davies 's adaptation of `` To Play the King '' and `` The Final Cut '' , the final two parts in the `` House of Cards '' trilogy .