these are model kits for 8 year old + children. basically you snap fit all the parts, pre painted and you end up with a very good looking model car. as a show piece, not a playable toy.
available in the toy section, i found mine in cape hill. on the internet i found some for £14.99, they used to be £16.99. you can get cheaper ones like £7.99 but they are the smaller versions. these are the biggest they do at 1:18 scale
EDIT: they are in perry barr stores aswell so must be in most stores across the country