i wish - I live in a top-floor flat. I've been thinking about excavating one at the allotment, but it's a heck of a lot of hard work, and there isn't really space unless I put it under the shed (when I rebuild it), which then introduces some structural complications... At the moment, I'm thinking of just finding an old fridge and sticking it in the shed. I've kept my tatties in a tea chest in the greenhouse over this winter and lost maybe 50% to frosting, so I reckon a better insulated container will probably work OK in all but the most extreme conditions.