Living on the Chiltern plateau, I have one in a pot, which I leave outside all winter, but right next to the patio doors. It prefers quite a big deep pot. I did bring it in the first winter, but it didn't like being put back outside in the spring once it had woken up early, so now it stays out all winter to keep it dormant longer.

Well it's still alive, but showing no signs of flowering and not doing too well. But I haven't succeeded in protecting it from the molluscs very well. It is gourmet snail-food, so you have to protect it well against them.

I wouldn't worry too much about "north facing" here in Britain. Obviously you don't want to fry it against a south wall. But it would like a bit of warmth and some of our low-intensity sunshine, in comparison to its natural range where the sun is as intense as Morocco or southern Spain, and temperatures in the mid-20s are common.