Sounds like they've listed it as a Cat "C" so you'll need the new MOT and then a VIC check.
The insurance company will ask for your V5 back before they pay out and as for the MOT, they can't cancel it but VOSA will invalidate it as soon as they receive the V5 and paperwork from your insurance company.
VIC checks are very simple, book your test, takes less than an hour at your local VOSA depot then they will issue you with a new V5. VIC checks currently cost £41. Have a look here for more info
http://www.direct.gov.uk/en/motoring/bu ... dg_4022107Hope that's of some help
