The cut off point is soon realised when the Man from the Ministry 'pulls' you for a road side spot inspection. Deep Deep Do Do if it ain't up to scratch.
Its the committment you make and the concession they offer for NOT demanding an MOT/PLATING TEST. Abuse it and get caught with a dodgy vehicle and it's 'Throw the book at you time'.
In March I was asked to present my 352 at the Ministry testing station, all routine stuff, I kept the appointment time and two very nice young men spent nearly a whole hour talking WW2. When I dared to ask if we could get on with the inspection, as I was running late for a meeting, one quickly kicked two tyres, said it was a real treat to see something unusual, offered his condolences about the fuel economy, and said all was in order and I could go. His only interest seemed to be matching engine and chassis number to the log book.
Very nice man.