Some of the R/T I hear from some professionals makes me cringe!
Here is an example I heard recently:-
"London Airline XXX on Daventry departure passing 2,500 ft"
"Airline XXX London what level are you climbing to"
"Seven Thousand"
"Do you mean Seven Thousand or Flight Level Seven Zero?"
"Ah yes, Flight Level Seven Zero"
Then again I wonder which Daventry departure he was on!
I don't know how you guys at ATC remain so patient!