Also while in theory they should be consistent there's always the risk they'll find something else wrong.
I think they just check the parts that failed.
I think they just check the parts that failed.
MOT retest can only be done by the same test centre. If you take it elsewhere it'll automatically be a new full test.
A retest only checks the failure/advisory items and items relating to it. For example if it failed on brake pads, then the pads would be checked along with caliper bolts, wheel bolts etc as well as a brake test.