Wettest ride I can remember down here in Surrey, but lots of fun if one met it head on – ie went straight through the puddles (small ponds…) not around them.
I was dry and comfy in a Montane Velocity jacket, army surplus goretex trousers, and a half-buff under the helmet.
I bought the trousers after a tip I read on here and they are a huge win, only 20 quid-ish from ebay, light, cool, brilliantly waterproof and long enough to overlap the top of my boots to reduce boot-water ingress. Big win. Buy a size up from normal to allow for restriction-free leg movement.