I think people get too hung up TPS/trade prices, VW discounts are extremely poor and marginal at best
Any main dealer will supply parts on request and the difference in price is often not that much different for items like this
Full retail price (what a dealer would charge you is £94.74 + vat = £113.69
@Tourershine paid £106.96 so around 6% less, not sure how much id mess around for £7 saving
Its fair to say not all items are like this and if you are spending big bucks or ordering certain items from certain product groups then the discounts can be larger but generally they are <10%