Martin, we have never had cucumber sandwiches for cricket teas, and I have been doing them since I was a young lass at the tender age of 5.
Filled rolls/sandwiches, ham and cheese, cheese and onion, stay away from tuna (they don't seem to like that), tinned red salmon, ham, ham, haslet, corned beef. smoked salmon and cream cheese. Sliced quiche (homemade of course) - remember it must be a variety of brown and white these days. In bowls
pickled onions, chutneys, sliced onion. Little scotch pancakes, rice crispie crackles made with mars bars and melted butter. Any sort of tray bakes. (all home made, don't go to the shops get the ladies to donate cakes).
For that special occassion we use to do a good substantial salad at lunch time with hot new potatoes, good quality ham, turkey, beef slices. Tomatoes, cucumber, radishes etc lots of pickles and chutneys (have a look in sarah browns vegetarian cook book or Jamie Olivers books have good suggestions) - followed by hot apple pie with custard or cheesecake. My friend won tea lady of the year with this option.