I'm not surprised that the documents don't match the car. Morgan use the same homologation for all trad models with provision for variation for each model. They should, however, make more effort to get it right where actual measurements are involved. The should also follow the practise of most other manufacturers and list possible variations in tyre sizes which can be important in some countries.
What does surprise me is that a year old car required such in depth inspection. Our car was registered solely on production of the CoC and did not require a MOT inspection (at an authorised garage) for three years. If it is a new registration the CoC should be all that is needed.
Don’t be surprised Peter. The factory have a very lax attitude to such things. They should be ashamed of themselves. It might have been ok in the quaint old days but they are trying to attract a totally different customer these days.