UPDATE: My parents got home from holiday last night & it turns out Dad knows someone who works with computers. I said that my photos & documents were being backed up before I try anything else. This morning I've booted the laptop in safe mode to try and find out how many GB's the photos & documents will take. Documents opened ok & I can see them all (anything done on Ms Office won't open as office says it's unlicenced, not true as I downloaded it from software4students.co.uk). The videos in Videos section of documents show (haven't tried to play them though). When I click on pictures, there's 2 things there, one says my pictures which I click on and nothing happens. Does this confirm update issue to graphics card or is it something else? I'm confident my photos are still on the hard drive, Dad is confident the person he knows will be able to salvage them somehow.
I've made it clear that I need it in writing what the problem is, what's caused it & cost to repair. The reason being that if it's due to updates not being installed due to unreliable internet, I can try to get to get compensation out of BT towards the cost (if successful, this'll be put towards my new laptop when I get it).