anythnig important get a courier to take it,,,

as i've said before my wife sent me a letter with my daughters birth cert in it, but my wife got one of the digits wrong in me house number, she put a 1 instead of a 7, and even thou the rest of the address was correct, and the post code was, and there are only 2 people in the uk with my surname. they sent it back to my wife in the philippines, and wrote on the envelope 'address unknown'
and we both were wondering where the letter was for months..