Countries of the UK: counted separately in a list of countries?

For example: say a German athlete has won matches in England, Scotland, Wales, France, and Germany. Would you say that she has won matches in THREE countries (because you’re counting the first three as one country)? Or would you say she has won matches in FIVE countries (because you’re counting the first three separately)?

(By the way, this has nothing to do with rules of the sports world if any apply here; that was just an example to explain what I mean.)