I used to just send my vehicles in for an mot and whatever they needed I done but some things that might need done are not part of the mot inspection and I got caught out a few times , also, if your vehicle fails on multiple advisories and your wanting to sell it on it’s easy for an interested buyer to look up its mot history and check what it failed on and if there’s a list as long as your arm they get put of a bit as they think the worst even although you have done the work and mot’d it , this isn’t always the case and most people are understanding so it all depends on the buyer . I try to do as much as I can to the vehicle and get somebody to give it a quick going over for the hidden wear and tear .