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Just get a whatever sleeping bag and wear your clothes.
Snugpak travel pak are cheap and pack down small.So wear a hat, down jacket, merino T, trousers and socks to bed in a summer sleeping bag and you'll be fine.
So what if you wake up a little cold at 4am. Just shake it off and go back to bed. You'll live.
Just make sure you're off the ground will a blow up matt. That'll keep you warm.
Whoa. Cheers. Looks nice but more than I'd like to spend. 100 quid is really where I'd like to be.