I'd never really given this any thought until now, but I once had the following exchange with ATC when I was in the circuit having just completed two or three touch-and-goes:
ATC: G-WXYZ So-and-so Tower.
Me: G-WXYZ
ATC: G-YZ please contact me on 123.45
Me: Changing to 123.45, G-YZ.
<Change frequency from tower to approach>
Me: G-WXYZ with you on 123.45
ATC: Thank you G-YZ - number one, report final.
It was the same controller (which I'd expected as the instruction was to "contact me" rather than "contact So-and-so approach") - presumably they were splitting/combining the tower and approach frequencies at the airfield? But was I correct in my initial call on the new frequency, or should I strictly speaking have gone through the whole initial call?
Cheers,
MD.