Just got a silk liner from e bay delivered for £10. its not mummy shaped but retangular packs down small and should be good to use on its own. cant remember what co its from dd hamocks i think.

Will try it out with my current set up but am thinking of a snugpak or similar bag for really cold conditions.:scooter:

Space blanket is useful
 

Few times in Patagonia and in Bolivia we were camping and I was bitterly cold, despite down winter sleeping bag, silk liner, thermarest and thermal underwear! On these occasions, I got my space blanket under the thermarest then wrapped myself with it over the sleeping bag. I looked a bit like a giant Xmas cracker but hey!

It does not create heat as such, but keeps the warm air inside and it helped a lot for me, as I felt warm quite quickly and I was able to sleep!