I agree, it all hangs on how we interpret that pesky phrase
"a body of a type which is characteristic of the body of a four-wheeled vehicle"
If the law interprets it one way we get fined for having a front number plate, but interpret it the other way and we get fined for not having one!
Sounds like we had better wait for the MMC to issue a ruling based on sound legal advice that we can hope they will have taken and that can form a safe harbour for us when we get stopped by plod!

notlob