MOT time can be stressful, often you are not aware of all the work that may be required on your vehicle until it comes to the MOT and make be left with a huge bill in order to get the car road worthy and to pass the MOT.
Although MOT guidelines are very strict and all garages are told to adhere to the same standards, some garages are more lenient and others are stricter. If you worry that a garage is failing items on the MOT that should not of failed then you can take it to another garage to get them to check it for you, or make a complaint through the .gov website stating what the car has failed on and why you believe it is incorrect.
You do need to have a certain amount of trust in a garage to be able to take your car to them for an MOT. If you are worried that the garage may add extra faults so they get more work out of the job then you could take it to a place that does just MOT’s and no repair work as there is no advantage to them failing the car. The only issue with this is you will not have time to be able to shop around for quotes if you need the car back on the road so be sure to do your MOT early.