Ah, perhaps because I don't have a UK address.
I know it's an enormous thread drift, but when I order stuff from the USA to be sent to Spain it doesn't bother the Spanish authorities at all, but when I have items sent from the USA to the UK (even small very cheap items) they are frequently intercepted and have to be collected (usually unopened) from The Authorities so they can administer a slap on the wrist if necessary.