Aren't all twats in the closet? It's not like they finally 'come out' and tell their parents, "sit down, I have something to tell you both: I'm a twat."
So far as people whose twattiness is still in the balance though:
Ray Winstone's a great actor, but he's in grave danger of becoming an older version of Danny Dyer in his ability to become a professional cockney at any given moment. Not quite a twat yet, but the signs are definitely showing.