Locking device is either split pin or locking nut on the end of the track rod or the clamp on the drag link to stop the track rod undoing carnt mean anything else lock stops are different to locking device hopes this helps and yes i am a mot tester
Most common is the fuel rail pressure sensor did u buy new or second hand as a new one from main stealers only comes with a new rail and has a modified wiring loom
Early ones eat transfer boxes and diffs due to vcu and later ones eat diffs cas they put a egg cup full of oil in them and don't even mention a k series
As I tester you are taught to pass and advise a car not to fail unless certain criteria is met also remember a mot does not mean your car is road legal