It paid off. He caught the only carp, whilst Phil and I contented ourselves with catching roach and bream on the feeder and float. I used the float for a couple of hours in an attempt to see what else was in the lake, but I only caught bream and only up to a pound or so. I had a carp run on the boilie rod, but it went straight into a snag and came off almost imediately.
So I sat taking photo's of the mallards and a mayfly as it drifted past, in between the rain showers and catching up on gossip with John and Phil, good company both.John returned a few days later and caught a fourteen pound mirror, but he's sure there are 20 pounders in the lake.
I might have to go back!