I was chatting on the phone to Richard last night (he's in Scotland on business), and he suggested we try potatoes in barrels next year, to avoid the possible blight problems at the allotments. I'm game, since it gives me more allotment space for other crops, but it means totally rethinking my rotation plan - again!
I'll just have to make sure he knows that watering them is his job, since it was his idea ;)