As far as cert/wof - there aren't any standards on the SEATS themselves (i.e. the arse perch foam and fabric bit) but the mounts, mounting hardware adjustment and rails all must be serviceable and secure. One car I got involved with recently failed the WoF due to the driver's seat not being secure in the lowered position on the height adjustment. The bushes and pins on the adjustment arms and cam setup had basically all developed enough slop over 14 years that the seat wobbled back and forwards about 75mm - it was all fully 'secure' i.e. not falling out but just the cumulative slop on all bits was just garbage for the 'grab and shake' test.
But, with the seat in the fully up position tight as a new one - flew straight through recheck. (Haha take that WoF guy - didn't check it at another setting!).
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