Fiona, another way to identify trees is to go to an Apple Day where they have experts who will identify your trees from apples (and photos of the tree if you also have those). We went to Apple Days at Ryton Gardens (Garden Organic) a couple of times. The first time it was good, but we got there too late to get an appointment with the experts. The next year we got there at the start, went straight to that area, and got to see someone almost at once. Mine, I think, was a Laxton Superb, P's were Discovery (definitely) and Kidd's Orange (almost certainly). I now have an old Laxton Superb and a Sunset tree, and step-over L-S and James Grieve that I brought with me.

There were labelled examples of lots of sorts of apples and lots of things to sample, so even the first visit was worth while. But not all apple days have experts on tap, and some are just excuses to sell over-priced, apple linked tat. Could you have themed weeks on your stand, for instance apples, apple chutney, juice, jelly, cards, etc? Probably not exclusively apple items, but mainly linked to the theme.