Ball joint boot.

Hi all I have a 1995 Range Rover which is booked for an MOT test tomorrow. I was doing some work on prior to test tomorrow and noticed that the n/s lower ball joint is split.

For anyone not familiar with the car changing the ball joints on these is not the straight forward job it is on most cars. My question is what classification of fail would it fall under, minor or major? The joint itself has no perceptible play.

I’m trying to decide whether to cancel tomorrow’s test and tackle it at the road side or let it fail and then take it to workshop at work where the job would be a lot easier.