You cannot buy it before the end of any existing warranty (in my case another All In plan). I called VW the day after the 2 year period was up as their system was still showing my van with the cover and I couldn't go any further (even though I had used the 2 years VW Assist, 2 MOTs and 2 services). It turns out that they regard the finish date as the 3 year point as that's how long you get to use the 2 included services. The nice german lady that I spoke to cancelled the previous plan on their system and I was then clear to buy the next one online. I have to say that I debated with myself for a while on whether or not to renew it as my nearest service centre is some distance away from me but in the end the advantages outweighed the disadvantages (including the annual 100 odd mile return journey for a service).