Raywood wrote :
The time taken to replace a bulb or wiper is not going to ... ring alarm bells and frankly I doubt the government are interested in that. They are looking for rogue garages who pass unfit cars.
And how would they ever find them, unless the car is stopped and inspected by police on the road shortly after the test?
A wider problem is rogue garages failing
fit cars. As most people do not have a clue about their car tech, it is easy for a garage to pull wool over customers' eyes and give a fail in order to get easy work .
I once was failed for a worn steering column joint. To the garage's suprise and disappointment I took the car away, and to their consternation came back the next day and put the steering column on their desk (I'd cleaned it) and asked what exactly was worn. They had to admit there was nothing wrong with it.
Similarly, I took a rather rusty (but safe - believe me I am a structural engineer) Austin 1100 for test and they said it would pass but for adjusting a rear wheel bearing (for £20). Rather than take it to another place that might fail it on the rust, I forked out the £20. Now : I knew, and they must have known (but they did not know that I knew), that you could not adjust an 1100 rear wheel bearing, but nothing was said by either of us. In other words it was a bribe.
The test should be done by Government testing stations (like in Northern Ireland I believe) but of course that is against the culture of outsourcing everything. At least it should be done by garages that are not permitted to do repairs. The system is corrupt, and a joke like Tonybur said. But the Prof said it is not a joke : OK, a bitter joke.