I'm lucky Shell garage 1 mile from m house!
I have to travel 24 miles for my nearest shell
I know on mk4's you can fill the expansion tank by pressing a little nipple in the filler neck with the end of the filler nozzle but I've not noticed one on my mk5.I used to be able to get about 63 litres in my bora if I was very low and filled the expansion tank up.