Tried the more static approach due to the impending rain which started 1/2 hour after I arrived. Took a bit longer for the fish to arrive, about 3 hours then caught a chub and 2 barbel. Chub about 4 1/2 (but quite a long and empty fish) and both barbel about 8lb (22:00 and 22:20). Have since found my isotopes so can maybe stay a bit later now if I want.