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Yup, spare batteries a must. Your GPS will use more battery with the backlight on and the headtorch is also good for any mechanicals (saves having to hold a bike light in one hand).
For the evening/night chill I'll have an extra base layer (but mostly I'll just put my rain jacket on) and I'll have a pair of cheap cotton inner gloves that I put on over my mitts. A buff is also good for keeping the chill off neck/mouth/nose/ears.
Stockport, Colchester or DIY?
Spare batteries and warmer kit?