Confidently I took my car in for it's second MOT today.  (2015 190BHP DSG 94K on the clock).  It failed.  Both rear tyres although they had a very healthy visible  tread pattern, were worn down to the metal on the extreme inner edge. The problem is that I check them every few weeks by running my hand over the tread and feeling the depth.  I also check them for correct inflation.  Being low down at the rear unless you either raise the car or get down and dirty this extreme wear was not visible.