Here is how to avoid extra charges on your MOT and few tips for preparing for one.
Before taking your car in, do your own little checks and all the things you should be doing regularly.
Not all garages are scammers but I am convinced that the ones that are tend to scam more with people who poorly maintain their cars as they are more likely to have no clue about their car's condition.
So if you have taken care of the things above, it may send a signal you are well aware of the state your vehicle is in and will call them on their bullshit but at the very least it gives you the freedom to choose your brands and companies to get the usual MOT type charges fixed.
On the way home, pop in for a quick wash / valet since your car is empty anyway and then drive home safe in the knowledge your car is fine and feels brand new.