Not only was I told directly from traffic police, I got it in writing from the DVLA that you categorically can’t use the vehicle until it’s in the database. As my experience showed , my vehicle had to be returned to dealer as it had a vat problem meaning it could not be registered and the DVLA simply returned the taxation paperwork to dealer. If I had had an accident or stopped for police whilst this all paid out I would be awaiting my court case !Not what the OP Fallais was told by the Policeman who stopped him or by the DVLA who advised the 14 period of grace had not been in place for many years. Did you get this advice in writing from the DVLA?