He still should get the disc repaired after all he spent £40 for it.
If you are selling the game on, or planning to do so at some point in the future, then yes ofcourse it needs to be done (though personally would leave it until I was going to sell it.) Though if your like me and you rarely sell games on and you can get it working from an install why would you get the disc repaired?
Thanks for your help, but just thinking I don't think it will work, as even the dashboard it straight up says in the tile the disc is not readable, so it may not even try and load. Will give it a go any ways.
As far as Im aware none of the shops in Belfast have the service to skim the discs, wonder if I have to send it off.
I have only had one disc get scratched and the dashboard recognised it and would play it but crash loading the game which an install solved but if your dash isn't recognising it you might be screwed.