For future reference, the Golden Wonder staved off the blight the best, and Anya the worst. Although the Anya has never looked particularly happy. I dug up some of the Catriona and Desiree and the potatoes themselves seem all right at the moment. In fact, I made a very nice potato salad with some Catriona.
Now I just need a recipe for the courgette that got away and is now an 18 inch marrow!