I, at times, have great difficulty understanding London Control or Gatwick Approach. I wish they would speak English.
This is from a U.S. guy, raised in Ohio and schooled at Dayton, the birthplace of Aviation.
I'm sure the above said controllers have equal difficulty understanding me.
For that matter, I can't understand either Bostonian's or New Yorker's if they speak too fast.
Kennedy tower is the worst!! They speak faster than I can think.