Old, crusty healed git, annoyed by pesky young kids playing near house.
.....I think that stories been running since Billy invented the printing press.
MOTs are very hit and miss whether they are dodgy or not. You could take any car to ten different MOT stations and I guarantee you will get very different reports.
I've been buying a few main dealer bits and then marking them up when they price them low on autotrader or take 9 pics and don't bother cleaning them. New stock sourcing methods.