Awesome thanks people!

This looks to be the one: 1.8T BBU,BJX,BKV,BLZ (+Aircon) 1032mm 6PK1035

I you are lucky you might still be able to read either or both numbers off that belt along with its VAG p/n. After getting the wrong belt sold to me twice for my 2.8 Passat, I finally read the numbers of the old one when it was 7 years old! So, I repeated this on my wife's Polo, "just in case" as I can't be bothered with weekly visits to the VW dealer's parts department.
 
lol, that's ok, I better get down the stealers see how much they want for the belt. Is it worth trying independent motor factors for such a part? I might try Kevin Coopers when I'm back in Cornwall.