There's a sale on at sports direct and we just picked up leather hiking boots for the kids at £25 a shot. Can't vouch for the waterproof claims yet, but they seem well enough built and our 9 year old had them on for most of the moot.
Link below if that's of interest.
http://www.sportsdirect.com/kids/kids-walking-boots?mppp=true
Link below if that's of interest.
http://www.sportsdirect.com/kids/kids-walking-boots?mppp=true