A couple of pet hates from "downstairs"
The controller who replies "correct" after every readback of a clearance from the pilot.
The London controllers who tell you on first contact, "ABC123 make your present heading a radar heading and after the vectors route REFSO, LAM, CPT for the BRS1C."
This has caused several problems with inexperienced crews unfamiliar with this type of clearance- why not just omit the "after the vectors" bit and when we are released from the vectors, just say "route direct LAM, CPT BRS1C etc?" We don't know at what point you are going to release us- it might be somewhere near CPT- we don't know. You will be surprised how many will miss the 'Radar Heading' bit and type in DCT LAM before being challenged by the Almighty!
Oh and I won't even get started on the "When established on the localiser, descend with the glidepath" which for a non-native speaker is like gobbledegook (believe me- I work with them- and they mostly struggle with this phrase). That is why you will often get the "cleared for the approach" reply to that one!