UK post codes are two part, something like A1 1AA. A1 identifies a geographic area, 1AA identifies a set of postal address in that area (its designed so each po

UK post codes are two part, something like A1 1AA. A1 identifies a geographic area, 1AA identifies a set of postal address in that area (its designed so each post code gets roughly the same amount of mail, so big organisations have an address to themselves). Zippopotam.us only seems to deal with the first part, which is only of marginal utility.