Well,

I haven't had mine a fortnight yet.

No breakdown, thankfully, but all of this understandably gives me the fear.

So, this morning, as per this thread, I called VW customer services to enquire as to where I stand.
I have a case number and a cas manager, so we'll see where it goes.

As I said, no breakdowns in my case, but it would be nice to remove the possibility of a breakdown for this particular reason.
Especially as I've just bought the car.