Thanks for all the input:
The original plate in the front boot has the 'Q'. This plate was attached back in 1973, by the Belgian Lotus distributor when the car was imported from the UK factory.
Fiberglass panels have the 'Q', I saw it on one of the doors under the trim. There is no number under the windshield.
Belgian car inspection authorities always look for the VIN plate AND chassis number and paperwork for every car, every year it pass inspection.
I might go the route to stamp the little Q bit again. I will let you know in a few months hopefully.
The body is taken off the frame now. We found a hole in the frame (and fiberglass) grinded by the PO next to the drivers seat (LHD) only covered by the carpet. I guess to do some repairs in the frame tube. That is now fixed. Also the front needed some new steel plates. The frame is now epoxy painted, and slowly build up again. Parts delivery is slowing down due to Covid19. Fuel tanks and swirl pot will be replaced by aluminium builds, they look nice! Engine, brakes, trans are send out for a rebuild by specialized companies.
I'm not doing the work myself but a small one man shop in the neighbourhood who does full car restores. He never did an Europa, but some Elan's. So far so good.
Bert