Reminds me of a story I heard on NPR years ago. The Scottish speaker said he was at an American dinner party when someone used the term "you Brits". He kept looking around until he realized she was referring to him. He didn't consider himself British, so to answer the question, "Who is British?" he told a story that went something like this:
As a young college student attending freshman orientation at Oxford, he met a nice fellow from Wales. They discovered that, if they both spoke slowly, they could just understand each other through their strong regional accents. They both needed a flatmate and so decided to room together. Finding a flat listed in the paper at a reasonable location and price, they set forth. The woman who answered the door spoke such a thick Irish brogue that neither of them could understand a word she said. So, she fetched a gentleman from down the hall to act as interpreter. But his cockney accent was so severe they couldn't understand him, either. Eventually, he pointed at the newspaper listing, she held out her open hand, and the two of them put in the first month's rent. So, which of them is British? His conclusion was that, technically, they all were, but in practice they were all something else. He supposed the Queen was authentically British, but if anyone asks, he's a Scotsman!