• A couple of tips.
    You won't be able to maintain a hard pace for the entire ride unless you are very fit, and if you ride at a pace that you can do for the whole ride you will get cold extremities, so make sure they are well protected.
    Snack all the time, sweets, bars, fruit and stuff, fill your pockets and keep snacking, the cold can sap a lot of energy and it is much easier if you keep your blood sugar high, but don't let it drop, especially towards the end.
    Some serious lighting would be a good idea, because even during the late afternoon in can be murky well before sunset. At the end of the ride, when tired and perhaps on roads you don't know too well, you really need to be able to see exactly where you are going let alone be seen.
    If you plan a stop for food and to warm up, add an hour to your riding time (partly because you are bound to stop for a wee and possibly a puncture.) so you need to plan your arrival time with that time factored in.
    If you let us know your route I may join you for some of it. I regularly ride from Reading to just past Stroud

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