Sonnendec,
This is not about British pilots but the English language and its use in aviation.
For example, the most professional demonstration of this I have heard was some years ago. A Lufthansa pilot checked in speaking German. The Rhine sector controller replied in English saying "For the benefit of all of us and flight safety, please speak English." He was a guy who truly understood why we have an agreed common tongue. To the chagrin of the French particularly, it just happens to be English.