'Used' sloes can also be used in biscuits, flapjack and presumably cakes. I was thinking of using up a cupful in a fruitcake this weekend.
Splendid idea. I tend to win or come 2nd in the local gardening club fruit cake making competition (yes, I was one of those who once came 3rd in a competition with only one entry! I think it may have been for my leeks) due to the vast amounts of alcohol I tend to apply. My next door neighbour (and club president seems to consider this 'cheating'. Pfft, I say. And pfft again. (nb, alcohol applied to the cakes, not the judges. Although now I think about it, that doesn't sound too bad an idea either ...)