Heard today at Biggin Hill, with the circuit packed, streams of aircraft getting back just before dark, two rotaries hovering between the runways, people stepping on each other's transmissions and the ATCO pretty much at the peak of capacity...fairly typical nice weekend day at a busy GA airfield.
TWR: G-AX Contact Approach 129.4
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TWR: G-AX Contact Approach 129.4
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TWR: G-**AX Biggin Tower are you receiving my transmissions?
G-AX: Sorry 'bout that, Tower, we were talking to each other.
TWR: Well, I'm terribly sorry to interrupt, but would you mind changing to Approach on 129.4?