A road bike with slick tyres. (These routes are possible on almost any bike, but it’ll be easier to keep the group together if we’re all riding something fairly similar.) Please make sure your bike’s safe to ride and in good working order, so that the group doesn’t get held up by avoidable mechanical problems. If you think your tyres or gear cables might need replacing at some point, sort this out before the weekend!
Puncture repair kit, pump, spare tubes and multitool.
A decent waterproof.
Please also check the forecast before packing, and bring along any gloves, overshoes, arm-warmers, knee-warmers, base layers or gilets you think you might need. This will be different for everyone, but if in doubt, it’s always better to be over-prepared.
You should also bring a couple of emergency snacks, and make sure you have somewhere (i.e. jersey pockets, food pouches) where you can carry them.