Try your local vw trade parts service. If they agree to sell to you (which they should if your nice) as they are trade only you should make a good saving over the dealer rrp. Just search for "vw TPS" and find your local branch.
I was livid, didn't damage my car in anyway to gain entry. They can do anything these days! I aren't claiming off my insurance because I am only 19 and passed end of September so my excess is £650! Managed to pay one from VW that had a 'spare' from a high up for a fraction of the price.. very lucky as they are £352 to buy otherwise.