Everything's been terrible round here. No sloes at all, no damsons, no plums and very few apples (yes I'm including garden fruit here as well). I think we had storms at the time all these were flowering, and the flowers just got blown/washed away before they could be pollinated. Then if anything did manage to set fruit - rose hips for example - the summer was so dreadful they didn't amount to much anyway.
On the other hand, my neighbour did spot some sloes near the coast and when I visited my sister in Sussex I picked some there, so there are some around, if you're lucky.