I would also like to winter camp more but I've decided to try to adapt the one I already own. I do not own a sleeping bag, I have a down sleeping quilt so I started looking at my problem as me needing a complete sleeping system. I have my groundsheet and I plan to put over that a Poundland windscreen cover, or something similar. I tried my local shop a few days ago but they didn't have any, I'll look again in the next few days. I already own a Thermarest NeoAir mattress, I've never identified that cold is coming through it from the ground upwards to me, but it is possible, especially if I try out colder conditions than I have so far. My quilt doesn't seem to have the same heat containing qualities that it once had but I'm going to stick with it. So my plan at the moment is to concentrate on what are the best clothes for me to wear at night. I already own leggings (from Decathlon) and they once covered keep my legs warm as toast, I will also wear warm loose socks (again from Decathlon) the real issue for me is my torso. Last November I was really cold in the Lakes, I wore a different and thinner pair of leggings and didn't wear socks. When I next camp I will put on my spare baselayer and I can then call upon my fleece and my synthetic Alpkit warm jacket and I will carry with me my Rab Microlight jacket as well. On my head, I'll wear my beanie and have my lovely £1.49 gloves from Decathlon close by. I'll try this out when I get to La Palma in early January, high up might be cold enough for me to experiment. If I can't get it right I'll have to think again.