I had a letter from my local dealer - book through myvolkswagen.co.uk and get a further 5% off the following...
2-4yrs old - 5% on labour, 5% on parts
4-6yrs - 10% and 7.5%
6-8yrs - 15% and 10%
8-10yrs - 20% and 12.5%
10+yrs - 25% and 15%
Also the note about a price match policy using genuine VW parts.