Our Red Duke of York was lifted as a first early last month. We got over 2kg from the seed potatoes but did have a bit of potato scab on the ones from our containers as you can see on the second photo.
The ones from our allotment were much better, the third photo is a take from 2 seeds. We left the rest in the ground and cut the shaws off about three weeks later so will lift some this weekend and let you know if there is any difference in size and quantity or not.