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We are going into the Chilterns - it's not the Alps, but there are hills. Couldn't you manage some sort of back brake ? I don't advocate fixed if you don't feel confident, and in any case the sprocket I can see on that wheel is too small for tomorrow.
Gearing: just looking at your pics I'd say your chainring is probably a 48 and the block 16,18,20, wheels 26". If I'm right that gives you possible gears of 78",69.3 and 62.4". If you're super strong the 78 (where you are atm) will cause the rest of us a good deal of pain trying to keep up with you, but if you're an ordinary mortal it will be you who suffers. I hope you've got enough chain at least to use the middle sprocket.
It seems complete. Scared as hell... That single old brake between me and injuries :)
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