I heard this R/T exchange at Goodwood during last year's Goodwood Revival.
Controller: G-xxxx hover taxi to 24
Pilot: Uhhh, negative , we are fixed wing
Controller: Oh, I'm sorry, I thought your were rotary
Pilot: No I've just checked and the whirly-bit is in front, not on top.
Try as I might I can't find it to CAP413 - must be advanced R/T!!!