I'm intending to bring a largish saucepan (how large I'll post when I find it!), a gas stove and enough gas for several saucepans of water. A wind shield for the stove, and spare matches in case the piezo lighter fails. I'll have some additional water, but don't rely on it, I'll expect most people who want tea and/or coffee to supply some water as well. Random instant coffee and tea bags (if you're fussy, then again, bring your own!), some sugar and a pint of milk (bought somewhere in the vicinity of Chez CrinklyLion). I'll have my own random munchies, which I'll need to keep my blood sugar level at a sane level all night, and I suspect I'll be carrying some of however many cakes CrinklyLion cooks before that night! I'll carry a folding mug, but if you want something to drink out of, bring your own mug, or be prepared to wait for someone else's to become available!
I'll carry my normal group ride maintenance junk, which is a couple of multi-tools, some adjustable spanners, a few common sized allen keys, a spokey, some spare cable inners, a set of V-brake blocks, three inner tubes (700C only, 23-35ish sized), possibly a spare folding tyre if I've got the room (again 700Cx25 which suits a lot of wheels), some tyre boots, a puncture repair kit, a decent pump (capable of >100psi), three CO2 cartridges, and a matching inflater. They'll probably be a few other random bits in there as well, like assorted M5 nuts, bolts and washers, and a spare set of SPD cleats. Probably also a variety of cable ties, and some insulation tape, both of which are handy "bodge-it" equipment! I need to remember to dig out a lightweight cone spanner, and Shimano Freehub lockring tool. It would be nice if I had a FiberFix Kevlar emergency replacement spoke, but the only place you seem to be able to get those is the states, so the postage is going to be annoying.
Aside from that, how much clothing I bring will depend on the weather, and exact selection may only occur on the night. Probably thermal bib tights, and baggy shorts, a long sleeved YACF jersey, and other layers depending on the forecast temperature. This could be a short sleeved jersey, thermal base layers, cheap thin Decathlon fleece, GroundEffect Two Timer etc I'll most likely wear my Shimano MT91 shoes, since they're Goretex lined, so relatively wind and waterproof. If I get the chance I'm going to get some flexible gaiters to seal the tops a bit, but it'll all depending on whether I can find anything suitable.
Aside from that, obviously the normal junk of lights, spare lights, spare spare lights, spare batteries (AA and AAA), GPS, camera, D-Lock & cable lock, mitts and/or gloves (depending on temperature), fleece hat (only if forecast to be very very cold). If they arrive in time, I may bring a set of spare spare spare lights, but based on the forecast arrival, there will probably be a card at home when I get back (I intend to use these for people whose lights have failed, since they don't need a permanent attachment on the bike).
I'll only be using the one pannier, so can't carry too much stuff.
