Mine is a T30 converted van. When mine was due this month, I put the VRM into the website of the company I normally use (pro tyre) and their system couldn't find the vehicle. Put into Kwik Fit, their system said Class 7. Phoned up ProTyre and he couldn't get it on their system either. I told him it was a class 4 (I know they can't do Class 7 at the branch I use) and he booked it in and presumably the DVLA computer for the MOT tester said it was class 4 as they did the MOT. You would have thought it'd be simple enough. I also took my V5 with me should I have needed to argue the point but it wasn't't necessary.