Apparently Britain is suffering badly from Late Summer Blight. So that's what we've got! I planted three blight-resistant varieties of potatoes, Rooster first then Carolus have succumbed to blight, just Athlete hanging on in there. We have dug up the Rooster, but we accept they may not keep well if spores have reached the tubers, and getting the Carolus is tomorrow's job.
Does anyone know if this is a new strain of blight, which would explain why it's attacking blight-resistant varieties?