Was the Jamie Cullum comment sarvastic? I like him. He has a weekly radio show on BBC radio 2. It's worth listening to as it plays a broad range of jazz and gives you info about the artists and styles. It's not pitched just at those already into jazz so its good for introducing you to the genre. If you listen to a few shows, then look into the artists that you like and check out who influenced them and before you know it you're into jazz.