I think that every British actor appeared in the movies! I saw an interview with Bill Nighy who said that when he was asked to play Rufus Scrimgeor he was relieved as he felt he was the only actor left in Britain who wasn't in a Harry Potter movie.
Doodle by Bill Nighy. British film and TV actor who played Rufus Scrimgeour in Harry Potter and the Deathly Hallows. Other credits include Pirates of the Caribbean, Love Actually, Hot Fuzz and The Constant Gardener.
Ranking The 50 Hottest Dudes Of The "Harry Potter" Movies