Glad he dug the data out, but yes lies, damned lies & statistics ...
Would be curious to see number of passes as percent of the number sold in that year. Again not perfect due to mileage/servicing/care but may be more useful which bangers have an Eveready bunny in them.
Would also need to resolve the 'spurious' failures. My daughter's Polo failed MOT in Reading - excessive corrosion on brake pipes and significant corrosion too close to suspension mounting point. As it was early for the test, she took it back to Bristol and checked it in for repairs/MOT. That garage said they would test first, and promptly failed it on emissions - "needs a new cat". After I confirmed the cat was new 9000 miles/18 months ago they figured they could try some snake oil in the fuel tank to see if that would help clean the engine. For £20 it duly passed the MOT.
1) The car did 4 miles between drop-off to pick-up - that snake oil is amazing.
2) They did notice brake pipes but did not think excessive
3) They agreed rot in sill was irrelevant to suspension mounting.
Bottom line - I figure it is worth trawling a couple of of MOT stations (as long as a car is failing) to find the cheapest snake oil. Especially as I had checked the car over myself in the first place - my skills run to most of the maintenance but not flaring/replacing brake pipes!