My son went to STS in Hitchin for his MOT and it failed due to emissions levels being too high so my son under their instructions had a new catalytic convertor fitted. It then went for a retest and failed again for the same fault so my son took it to my local garage to get the emissions sorted. It turned out to be the Lambda sensor which was replaced. It was then tested at my local garage and although it passed on emissions, it failed on rear nearside brake not working, anti roll bar being corroded, drivers seat mountings unsafe and rear wheel arch subframe mounting corroded. My son took it back to STS for a retest and it failed again on emissions (which were OK) but passed on all other things. Shows that STS passes vehicles according to how the tester feels and not by a proper MOT. The car is now been scrapped due to it being so unsafe.
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