Bobike Poncho, £19.99,

Without a rain jacket, waterproof trousers or boots children risk a soaking while stranded in a child seat. The Bobike poncho slips over both seat and child so that water doesn’t pool in the seat. It covers both body and legs and is suitable for use either when in a front or rear seat. It packs into itself like a ‘pac-a-mac’ and has an elasticated strap so it can be strapped onto the seatpost when not in use. The hood has a drawstring for further waterproofing and has a clear section around the brim to provide increased visibility for the child.

PROS: keeps kids dry (still need layers for warmth)
CONS: very specific use