I honestly wouldn't hold out any hope. For one thing, there is the ability to be able to prove negligence, and as I found out earlier this year when I wanted to make a claim, that isn't so easy as it might seem. Oddly enough, my knee too - I am a postman and was off work for three months following an accident in a supoermarket.
Secondly - as I also was told - there is a time limit involved to make a claim and I suspect you are beyond that.
The best I can advise is that you try calling one of these accident claim lines - if you get nowhere then I would say there really isn't a chance unless you are prepared to risk your own money, and you'd probably be advised against that.