Quite interesting to watch again this year. Many folk will either fish pretty standard lures and damsels, or if they feel it might be a good idea to go smaller, they will fish buzzers and bloodworm.
Many will miss out one of the best tactics for this time of year, wee damsels, spiders, crunchers and hare's ears for example ...... small nymphs and wets ( 14s at Haddo ) fished quite quickly just under the surface
When the fish are rising, try the above as well. If you are fishing dries and not getting good results, think about the surface, sometimes the fish will ignore flies that are "high & dry", try to get them sitting in the surface film and sometimes better still, just below the surface
Cheers
Mike