A different perspective. When operating in Paris airspace yesterday a G reg bizjet was asked what his IAS is. He replied with a load of waffle. "Oh it can be 250, 280, whatever you want it to be". He was asked again what his IAS is. Once again, he replied with the similar waffle as above. It was pretty apparent that the French controller doesn't speak English but he didn't want a load of waffle back, he wanted a clear concise ICAO type answer. He didn't get it.
RT discipline isn't just for other nationalities...