First off I would get a letter in the post to him Monday morning stating the circumstances and that you hold him totally liable for your uninsured losses, these could include the cost of a hire car, loss of earnings, excess etc... Ask him to forward the letter to his insurance company. If you know who he's insured with also fire a letter off to them stating time and date of the accident that you hold their policyholder liable, no need to go into too much detail at this stage. After this letter don't communicate directly with his insurance company again, always and only though your own.
After your initial phone call to report the accident, preferably put everything in writing to your insurance company but if you must phone document everything you say noting dates and times and who you spoke to.
If the insurance try to go down the 50/50 route, decline and say you are prepared to go to court if necessary. He may have denied liablity at the scene. Sounds harsh but he was right to - you shouldn't admit liability even if at fault at the scene of an accident. However at the back of his mind he'll know the truth and the thought of it going to court may just make him back down. Let the insurance companies fight it out between themselves, it's what we pay them so much to do. Don't back down at the first hurdle, it may be a long process if there's a dispute but stick with it an 'at fault' accident claim will have a direct affect on the cost of your premium for the next 5 years

Good luck and hope you get your Mini fixed soon

Edited by miniyellowmini, 28 April 2012 - 11:29 PM.