In reply to Ian Archer:
I've just been looking at this sort of insurance for my son, who passed his test yesterday.
Some of the reviews on TrustPilot make it seem like these black box insurers will try anything to squeeze more money out of you, and sell the insurance premium at a loss in the hope of catching you out later (driving too fast, accelerating too hard, driving too many miles at peak times etc.). I'm almost certainly going to steer my son away from such policies, unless the provider scores some decent reviews, and their small print isn't full of gotchas. Maybe "More Than" are OK.
Your friend needs to check the T+Cs very carefully, as he will probably be liable for increased premiums due to the non-declared scratches etc. If it's clear that he'll be OK if he keeps the policy until the full 12 months, and no inspection will be required, then it might be best to do that.
Good luck to to him.
Edited: typos - I assume that the dislike is from a grammar nazi?
Post edited at 12:15