they may look up the build date and expect it to meet the ADR's of that date... the lights and dash may be an issue and you may also need a windscreen demister
Yep, that pretty much sums it up for me. The vehicle will have a 1971 build date (from the Series 3 chassis) and so I'm worried it won't get through with the 1968 2a lights and dash. At least it has a demister Probably not willing to take the risk... so back on the hunt for a vehicle with a less-convoluted ancestry

Thanks everyone for the replies and comments.