I can't get them to work ... different varieties ... in pots, in the ground, under cover, outside ... they all make a plant under protest through the summer and then make tiny tubers (seriously I've grown gigandes beans bigger!). I give up ... and the general impression I get is that many others in the UK have wasted hours coming to the same conclusion. It's a sub-tropical plant.
Why bother when there are many great performing sweet winter squashes like buttercup that can be cooked in exactly the same way and taste almost identical?