Chris,
i have just finished a claim and treatment for whiplash. I had a toyota avensis smash up the back of my old car at about 30mph. crushed the back of my car. First thing i did was went to the police station and reported it as an injury accident. i then went the docs and she noted it all down and she referred me to a physio to which i had 8 weeks treatment. lower back and neck with one of my traps damaged also.
if you have whiplash it is VERY painfull