Saw this as well - interesting. Some of the specific stats in the tables are wrong (e.g. total failures 327, failed on brakes 379!!), but that'll just be an issue with data entry etc.
I guess the passes are passes at first attempt and do not include the re-tests of those that have failed, so the total number of exxies put through an MoT would be 800 in 2007, with nearly 60% passing first time. That's how I read it.
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