I have an account with a bank in Australia, and recently, through some form I’ve filled out, they’ve discovered my London address. Unfortunately, the UK address has made it into their system. And they’ve sent a credit card statement out with the UK address, through their standard local mail system, with no postcode, and without “UK” written anywhere.
I wouldn’t know about this at all if at least some staff at Australia Post and at Royal Mail weren’t very clever. Without any demand for extra postage, the letter from Australia was delivered, with only a house, street and number in London to get it here.
Test your postal service today!