Tom Hanks, whenever he appears opposite the likes of David Letterman or James Corden on an American talk show, comes ready to play, with plenty of material to delight his host and audience. Showing up on Graham Norton’s laid-back British talk fest, Hanks is liable to take it easier. But expect just as many laughs, because no one is better than Norton at making his guests feel at ease, and to get very, very funny moments out of them. Other guests sharing couch space with Hanks tonight include Gemma Arterton, who’s providing the voice of Clover in the upcoming miniseries version of Watership Down, and Joseph Gordon-Levitt.