Tubers should be lifted after the first main frost has blackened the leaves. When that happens, cut the stem so that you see about 3 inches of stem above soil level. Leave for about 2 weeks. This encourages eyes to form. Then dig them up. I get the hosepipe out and spray the tuber so that all soil is removed, and cut off all the fine roots. Then let it dry for about a week. After drying, store them in boxes of dry peat/old compost, leaving the crown exposed, in a cool room where temperature does not go above 50'f, but preferably cooler, and doesn't go below freezing.No heat is required.

Fantastic :) Thank you!