I've downloaded Any Video Converter which I'm going to have a go with next week; I won't get near the computer over the weekend most likely; teenagers. I'm also going to see if I can resize the files so I can back them up on Mega, preferably without having to pay for extra space as the budget is a bit tight right now; see said teenagers for the reason for that, eating us out of house and home!
I've got a standard 64gb USB flashdrive that I'll probably put some of them on and see if they'll play on the Sony Blu Ray. My main concern right at the moment is to ensure I can't lose the files. I can't store them on my internal HDD as there's not enough space and my second external HDD is my backup for the actual PC. I think I probably need another HDD so I have less chance of catastrophic failure. Thank you for your help so far guys, I definitely appreciate it.