Think the q plate only applies if youve got a heavily modded vehicle where the original is effectively a doner. Think if it has an identity already and you modify by increment it wouldnt really apply. We will see. Official clarity will be forthcoming nearer the time. Possibly the notifcation of mods will initiate a procedure. Cant see it being retrospective really but the scooby thing isnt a significant mod, just 1 point but it will, as described above, increase beyont the limits set so it would only reallybaffect the tax status ie not historic. You would have to wonder though as if to hether stricter MOTs might become a factor! That would be ironic given that theres probably not many basket cases with scoobies in. They are more likly to be the better buses that attract that level of investment from the owner. A feasible conversion within the rules which could feasibly have been done prior to 88 would be a 2.1 waterboxer. Or stick wome tinware on your scoobie lol!