My pet hates:
A/C: London control Speedy123 FL230 to x
ATC: Speedy123 London Roger, squawk ident
A/C: presses ident button
ATC: Speedy123 Squawk Ident
A/C Squawk Ident Speedy123.
Why do we need to read back SQ ident? Surely you can see it on your radar screens? You have our callsign, a/c type and sq code displaying, along with a flash when we ident, you know where we're coming from, and where we're going.
Another.
A/C: xxx Radar Speedy123 descending FL70 to the centrefix RWYxx, Space Shuttle Charlie with information Xray, QNH 1019, request deconfliction service outside controlled airspace.
ATC: speedy123 roger, descend FL40
A/C: descend FL40 speedy123
ATC: Speedy123 latest information is Xray, QNH 1019, turn left hdg xxx, what service do you require?
A/C:
I just told you I had Xray 1019, I just asked for a deconfliction service.
ATC: speedy123 descend altitude 3,000ft, QNH 1019
A/C: descend Altitude 3,000ft, QNH 1019 Speedy123
ATC: speedy123 descend altitude 2,500ft, QNH 1019
A/C: descend altitude 2,500ft QNH 1019 Speedy123
A/C now on finals etc:
ATC: Speedy123 contact tower on 123.450
A/C: Contact Tower 123.450
A/C: xxx Tower Speedy123 ILS etc etc etc
ATC: Speedy123 roger, QNH 1019
A/C: QNH 1019 Speedy123
ATC: Speedy123 cleared to land rwy xxx, surface wind 360/40G80 etc etc.
Sorry, do you want to run the QNH by me one more time, I don't think I got it the last 8 times you gave it to me