It's definitely worth looking at pursuing, however don't use one of the shitty companies advertised on the TV, like Claims Direct, as they tend to treat you like a piece of meat. If you look about on Google you'll probably find some good sites that will have reviews of local solicitors. All law firms are, in the end, basically just interested in how much money they can make out of you, but there's a big difference between a reputable high street firm and the scumbag firms that work like litigation conveyor-belts.
How serious was the crash? Did any of your friends actions contribute to the seriousness of it? If you were a right f**ker you could more than likely screw a bit more out of them by going to a psychiatrist and playing the post-traumatic stress disorder card. It's not very hard to do if you find the right shrink. I'm not advocating this as, in my opinion, it's pretty evil; just stating the facts.
Insurance doesn't really come into it from your side of things. If the other party isn't insured then they'd be liable for criminal prosecution, which is brought by the crown rather than individuals. The action you'd be bringing against them would be civil, which is completely separate. Also, there's very little chance that it'd go to court. 97% of civil claims are settled out of court using alternative means due to costs and stuff.
If you've got any questions before you go to a solicitors then give me a shout. I've just done a metric tonne of essay and exam work on this exact area of law .