in all fairness you did crash into him. unlawfully claiming for whiplash though is just pure rude.
is your insurance going to cover the damage? have you protected your ncb?
the mrs bumped her car recently and its going to cost 400 quid plus to put right , contacted the insurance who told her her premium would go up by 600 quid if she claimed , even though she hasn't had a ncb since the day she opened the policy with them , 7 years ago. every year she enquires about why she isn't getting a discount and every year they come out with some other bull sht excuse. makes you wonder what the point in having any insurance is in the first place , third partys take full advantage and its not worth your while claiming for your own damages.
if it wasn't necessary by law id certainly consider taking my chances.