Not an expert, but I have done a bunch of reading on this - so, in short...
It matters not what your V5 says when it comes to Road Traffic Offences - the important thing is where the vehicle sits in relation to the Con and Use regs
The Road Vehicles (Construction and Use) Regulations 1986 (Part 1 Regulation 3)
As hinted at above - there is vast amounts on this on the forum, spend a happy hour, or three reading you will be wiser for the experience.
It matters not what your V5 says when it comes to Road Traffic Offences - the important thing is where the vehicle sits in relation to the Con and Use regs
The Road Vehicles (Construction and Use) Regulations 1986 (Part 1 Regulation 3)
As hinted at above - there is vast amounts on this on the forum, spend a happy hour, or three reading you will be wiser for the experience.