I have grown setanta potaoes also, they make the best roast, chips and mash such a great flavour.
i have had to keep mine in the green house because of the high winds and it damages the foliage so badly,the greenhouse is fully open.Watering every day with this hot weather.
i did plant mine in march so they are looking a bit worse for ware, hopefully i will get a good crop when i harvest them, they are in 40l tubs as i cannot dig the ground,older age is a bummer
.Lillileaf