Its bad that everyone automatically goes out to claim everything they possibly can these days. Medical proof will be required though for him to get whiplash claim to go through, and if the damage on the car doesn't imply a high enough speed impact to induce the damage then it should get thrown out.

Sorry to hear about the accident though, not had the misfortune to hit another car yet in 7 odd years of driving, only thing I have hit so far was a Deer at 70mph, thankfully only a baby!