Hi, I'm not from the UK but Belgium has almost the same weather I guess. I'm also wondering what to do with the bananas that need to stay indoor during winter. I didn't have a good result with keeping them in a cold room +/- 10C. I had to cut my Dwarf Cavendish to the root but it's grown this summer to a beautiful plant once I put it outside in my garden. It looks like the sudden shock from outside to indoor is too much or else I'm doing something wrong.
Someone said to me that putting it in the bathroom would be excellent because it's the most warm and humid place but except for a small plant that's a no-go
