A few months back i had a car crash which was my fault, luckily wasn't too serious. Anyways one of the passengers in the car got injured (slight whiplash) and i heard from a friend that the passenger may claim compensation. I was wondering if anyone knew how this would affect me if at all?
Yep, your passenger can claim off your insurance - so long as your insurers were happy to pay your claim (ie you weren't drunk, etc), then they should pay your passenger.
Basic whippy isn't a massive amount of compensation, but any personal injury claim will increase your premium more next year than if it was a straight forward accident.