Oooh - so that Guest was my Santa? And I didn't get a close look at you!
Monmouthshire, dear Santa, is on the south eastern side of Wales, just before you get to England. It has a noble history and was the birthplace of Charles Rolls (as in Rolls Royce), Henry V and many others. So setting your reindeer's SatNav to the post code given will bring your sleigh to our door, pretty much.
Normally speaking I know you don't have any trouble with the taxman and import/export duties as you simply fly above their heads ... but gifts from outside the UK coming in are free of tax if the value is £36.00 or below as long as you haven't put any special delivery charges on top of the value of the goods.
Does that help?