In reply to Dell:
Thanks, yes it was inexpensive, which was great. I actually tried it at around -2*C and found I was a little cold, so started wearing merino and now I'm fine.
That does lead me to think that I'd definitely be cold at -10*C though. I'd love to get a top of the range synthetic or hydrophobic down bag, but I really can't afford it, so that's why I'm looking at a more cost-effective option.
It's good to know I'm doing the right thing by wearing merino. Maybe I just need to save up for better kit.
What kind of sleeping bags/prices would you be looking at for a good winter bag that's a step up from mine?
Post edited at 20:15