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I remember the morning I woke up once, everything was covered in frost and my water had frozen.
I zipped my bivi back up and went back to sleep. Garmin was reading -5.Nice!
My PHD stuff turned up this week, it's great. So you're bag should be nice. Good quality.
skinny-
You have a nice bivvy though and a sleeping bag. I only took the bivvy with me as an afterthought and thought "hmm I've carried it maybe I'll just try it out". If anything it got me thinking about bivvy locations and what's good/bad. The spot I picked would probably be fine with a sleeping pad and sleeping bag. I also thought about using a dark corner of a public park but didn't want the local drunk pissing on me on his way home so went for farm first. Those 20p, single occupant public loos might be another option as are the more enclosed bus shelters. Depends how many people are up and about.
hippy
Because I didn't carry one and because that's where I was.