HPicheck may be "the the number one provider of vehicle data in the UK" but isn't as helpful as other UK check sites for the sort of plate info we use on imcdb, so no reason to add it as one of our links. Other sites give same/more free info, mostly without having to provide an email address so avoiding receiving "you did not follow up your enquiry" emails. (Although would agree that if buying a used car in UK an HPicheck is pretty well essential for providing a detailed history - the difference is that most of the extra info is irrelevant for imcdb purposes).