It's a fail, or in Keith's words not to the requirements of the IVA manual. I cannot fault Kieth, very fair and honest explained what the requirement was and it should be tested. He crossed reference every failure to the manual. Hell of a day the trailer lights failed (13 to 7 pin adapter faulty than blew car light lights), spent time fixing that problem in the end it was easier to get the wife's car to tow the trailer. A good point about caravan towing we always have a spare car with tow hitch.
Failed on;
1. Metered emissions exceeding both carbon monoxide and hydrocarbon.
2. Reversing lamps - annoyed with this one because I tested all lights before going on the trailer bulb and fuse OK, suspect the switch.
3. Masses and dimensions, used figures from forum failed - need to amend declared weights.
4. General construction - fan fuse in engine bay by open to elements, need water proof housing and starter terminals need rubber covers.
Overall happy with the results, only a small list to do and all easy to fix. I need to find a guy who can tune twin dellortos and travel to do the emissions or borrow a trailer again.
Anyway thanks for you help.