you can't be failed as the vehicle is tested for manufacturer's standard equipment: i.e. if your vehicle doesn't come with washer jets or auto levelling from standard they won't test for that.
they can fail you for glare, an irregular beam pattern, if the manual levelling system doesn't work (these need to be transferred to the new headlights from your OEM ones)
it will also depend on the tester and whether he's in a good mood or not...
MOT is only half the battle - VOSA roadside tests are really common where I live and there absolutely looking for every and anything to pull you on. I wouldn't want to risk it. :/