I am sure a lot of readers of this post are now intrigued as it could just as well happen to members with Series 2s and later engines in our vehicles! It would be nice at the end of the day to get a summary of the outcome of this for the benefit of the readership.
One question that you may be able to answer: if you get an age related plate based on the 'newest' component for what they are calling a 'built up' vehicle, can you transfer on an older, age appropriate number at a later date, or is this verboten like for a Q plate? This would at least make the vehicle look right, especially in a case where the age of the vehicle is actually known with some degree of certainty?
I assume using the newest bit for dating purposes is to stop someone building up a relatively modern vehicle and sticking in an old part, such as the engine, to get tax/MOT exemptions?
Needless to say, my chassis is stamped in several places!
Maybe this problem needs making known via various LR publications for people to check and stamp their chassis, to try and reduce the numbers of problems in the future, and save vehicles from unnecessary loss of identity?
Sunny Jim