In reply to Flinticus:
> Looking for the perfect bag re: 1) weight, 2) pack size, 3)water resistance and 4)temp comfort level should be around 0.C. 5) £150-£200.
Pick three of those!
If it wasn't for no.5, I'd say get the lighter version of this
http://www.ukclimbing.com/gear/review.php?id=3605 because it's a superb bag and very few touch it on small weight for warmth - but cheap they are not.