Javed, How do you know that other garages are logging cars in for 50 minutes and doing other work in between, if it is fact then you should give there details to VOSA, if it is rumour then no doubt VOSA will get to here about it eventually. How are VOSA supposed to catch a garage that carries out a retest by just logging the vehicle in then not doing it, they would have to physically be there to see it. We charge full fee for test and retest unless we do the repairs and we haven't even gone live yet. If I knew of a garage near me that was abusing the system I would drop them in it no hesitation.