I once did a silly quiz for someone at work - an American who'd lived in Britain for ten years. "Are you British or American?" the quiz asked. I then set up scenarios, like "Your boss comes into work wearing a vest and suspenders. How do you react?" and "Your child's teacher asks them if they need a rubber. Are you outraged?"

By the way, re. the reply I've just posted: It's probably a good idea for you to remind me about Watching the English nearer the time of the banquet.