I use Quantum Synta 10W40, which I buy from the not-so-local VAG dealer. Do Seat/Skoda dealerships, which are closer to me, sell the same stuff? Incidentally from VAG it's pretty cheap, less than 10 for 5L, from memory...
GSF do sell it, and deliver. May not be much point (given the cost) How about buying two while you're there? Simon.