What are the differences among england, britan and the UK?

UK is United Kingdom and it represnts those England, Wales, Scotland and their colonies.
Great Britian (大不列i颠)s consisted of England, Wales and Scotland.
England (英格兰) is only the terrioty of the midland area.

this is better link for harry potter movie # 1


http://www.imdb.com/title/tt0119217/board/reply/155628307


movie --- harry potter and good will hunting - prodigy with insight into social issue and university environment


http://ow.ly/1sEBG

看到 001 的英文答案，悚然自問：他是在磨練他的英語運用嗎？
為甚麼他不知「獻醜不如藏拙」這句中文常用語的意思呢？
用英文作答，本來可以接受！但錯漏百出，也非原意吧！