For Emma-Jane - that's a pity about your Red Duke of York! They were beautiful potatoes - far and away one of my favourites on our old plot; but soils, and micro-climates, and all.
I actually bought Jersey Royal new pots - several times in the last month. Eeeeeh - it did me good to hear the kids slag them off, as tasteless, watery monsters, compared to the RDoY we grew ourselves!
Never mind - lots more to try!
All best - Gavin