Google Barnsfold on here and you’ll find plenty of previous advice.
Fished last Sunday evening ticket with Fritzcat and met some of the others who had come along. Had 7 between us (well, he had six and dropped as many), I had one, dropped half a dozen then at the end hooked a monster on a sz16 black buzzer that did three strong runs, 2 runs off the reel even with drag set, had me almost down to the backing. “Flanks like a dustbin lid” according to FC.

If the fish are showing try small buzzers black or olive either greased up tippet in the film or a suspender pattern. If they aren’t showing you should catch on a white lure, a fritz or minkie pattern fished deeper or booby off a Di3.
Also a good hatch of caenis present and they were interested in a sz20 white dry on Sunday. Some had caught on sedges too.
You’ll find it quite full of algae on the downwind banks at the mo so choose your spot.
Haven't fished a full day for while there so maybe someone else can also help on that?