Follow these instructions NOW!
1. Report accident to Police and get reference number.
2. Get in touch with the best Bicycle specialist solicitor there is at: http://www.bikeline.co.uk
DO NOT deal/have contact with motorists insurance company-you will get shafted-let a trained solicitor do it for you. Things always turn nasty when the insurance company gets involved. Clear liability will turn into 'not our clients fault-you were speeding/wearing black/no lights/reckless cycling'.
Personal experience-top bloke.