I'm sure many area's of expertise have things like this happen. My car too wasn't exempt from that MOT emmsion regs, rather it had a different standard applied. This was because my
exact model did not appear on the MOT database (being a limited edition, with different engine components) so had to be tested using these different rules.
I only discovered this by accident, I was sat with the MOT tester as he was going through the cars trying to find my model (this is the OLD system, things are different now) and he was like:
Him: "this is close enough to your car2...I'll pick that"
Me: "that is not my car, that model has a different engine"
Him: "what about this one...?"
Me: "that's not my car, that's even more different"
Him: "Ok, it's not on the list, that's fine, we'll use these rules"
In this example the guy listened to me, realised I was right & made no fuss at all. However, I can see how many would NOT do this and happily put my car through as the wrong model / variant meaning that
technically I did not have a valid MOT. Imagine if I had an accident and the insurer was checking my documention & found I had an MOT which listed an entirely different car? He ain't gonna pay out.
Thankfully, as in my example above, many people are happy to be informed that something isn't as they believe. However, you do get those whose minimal knowledge seems to equip them only with arrogance...
On an aside, it was always funny to see certain garages open the bonnet of one of my cars to check the engine / oil etc. only to look very bemused when there was no engine evident. They'd then go around back and open the boot...still no engine, more bemusement. Then they'd finally realise that the grills in the MIDDLE of the car were there for a reason and finally get there.
On that note, I just remembered this one from years ago...
I used to have to visit one of our company sites miles away periodically. They had a parking policy saying "All cars MUST reverse park in the marked bays" they gave the reason that this policy was put in place after a car fire where they could not get to the engine bay due to the car having nosed into the space, preventing access.
Now, I understood the reasoning behind this policy, it made sense after such an incident & I didn't blame them. However, if I adhered to the rules in my Mid-engined car (engine bay access from the rear) I'd be going
against exactly what it was intended to prevent. The security guys got this, being into their cars, however once again you can see how this could have gone the other way - I think many of us here would have expected it to!
Sorry for the slight off-topic there
Scoob.