Make sure that you write to the police before hand, explaining your case, quote the relevant sections of the act(s) re. Speed limits & type approval. Also make sure that you make them aware that you’re going to claim costs should you win the case. If it goes to court, make sure you claim costs AND that they are awarded BEFORE you leave the court room. It’s easy to get caught up in the relief of winning & forget to lodge your claim. Generally the magistrate is on your side & the onus is on the police to prove their case. If you read this
DVLA you will see that the body type & taxation class has absolutely no relevance when it comes to speed limits, & the DVLA have issued a statement to that effect. Make sure you include the DVLA statement in your defence bundle.
Good luck