though some may have to be paid for in advance dew to the ordering system
IKWYM
If you get on well with your local GSF, and they are friendly people, they (can and could) order genuine VW OEM stuff Tuesday lunchtime and have it from germany in their shop by Friday afternoon!
I think the guy they phone at GSF HQ to get a price and put the order in, is 'Martin', but could check if you like.
They price them cost + and the + depends on how they're feeling on the day, usually they are similar, slightly cheaper or occasionally slightly more expensive than VW UK.
But the service is infinitely better and I refuse to do a 40 mile round trip to prepay (VW idiots won't take my card over the phone) and then again to collect... and put up with jumped up pinstriped 'parts salesmen'.
My local GSF is just superb all round.
Whilst my nearest VW parts 'emporium', Wayside W&^!ers Ltd, seem to have zero comprehension of both commercial common sense or modern payment methods.