To be honest, I'd leave it for a while if I were you. You have only done 4k since the last service, the 12 month thing is a load of rubbish - designed to line the pockets of dealers. When you sell the car, only a very very very picky buyer would pick up on this,,, and 1.8t's are worth so little (as I am finding out) it will nowhere near cover the cost of extra servicing.
I would wait until you are nearer 10K since your last service, if your mileage remains really low, then maybe sooner.
The benefit of having a 12 month service (even if mileage is really low) is that they may identify something about to fail that saves money in the long run - i.e. damaged CV gaiters etc. However, that would be picked up on the MOT
AND, remember that many new cars are 2 year / 20K now anyway... So that blows the 12 month argument to sh!t!