Trevor I've never used a fly rod to fish floaters. However before casting a bait to the fish get them feeding confidently even if it takes a couple of hours. Once the fish are really feeding you should get a few takes. I hope this helps and isn't telling you how to suck eggs.
To Richard Farrow thanks very much for the info it was just that I remember John Wilson
fishing this way once and thought I would
give it a go. But could not remember the
exact tackle etc he used anyway thanks. Trev