I love this type of response whenever someone fails a car.
Item 16, if there's a bootlining kit, there are several areas in the boot that the tester cannot inspect, the rear of the seat back being just one example. All he's done is note as an advisory that he can't see it to properly inspect it. Kind of the same thing with the underseal. If he can't see the seams around patches, but know there are areas that have been repaired, then he's noted that he can't see how good the repairs are. It's his name on the certificate, so he's totally entitled to make notes like that.
The rest of it, is it really that hard to believe that it's genuine? Most garages wouldn't want the work, I doubt they've got a load of stock of subframe mounts.
all looks good to me and i been testing 23 years . if you dont advice and somone moans we get it in the neck of the ministry !