I've seen blight on most potato crops on my allotment site. As for my own crop of earlies, I've recently sheared them all, dug up half of them, and will shortly dig up and store the remaining crop. What I've harvested so far have been great and delicious. I'm reluctant to grow maincrop spuds, for fear of the dreaded plague. Still, you can't beat a good crop of new potatoes!