My radio won’t turn off , I’ve removed f8 fuse , the car cut out and radio went off , However when I replaced fuse and restated the car the problem persisted , I tried holding radio start button fir 20 seconds , this hasn’t worked either , should I disconnect battery to reset ? Thanks in advance :) 

You can try disconnecting the battery but assuming you pulled the right fuse, it should be more or less equivalent.

 

Not an issue I've heard so apart from pulling the down, I'm not sure what would cause it 😕