Been there, done that & I'd say like me you'd settle for his head on a plate at the moment rather than money.
http://www.cyclechat...cident-outcome/
Agree with snorri with regards the posting of the drivers details, it could well backfire. I'd edit the posts in which they appear, removing the details.
Make a formal Request to the police at your local station, done in writing, keeping a copy for yourself. Ask to speak to the Duty Inspector with regards making a Formal Complaint. It has to be him/her that takes the complaint. Both of these are the first steps in any complaint against the police & the IPCC cannot be involved until the local force have dealt with your complaint.
Don't do what I did, which was have the matter resolved at a local level. It limits what you can do later & what the IPCC can do.
With regards what parts of the vehicles made contact. If you hit the side of him then you may be said to be the one to be at fault. Even with the give way to traffic already on the roundabout rule. If the front of his vehicle hit you then it could be taken as further evidence that he wasn't driving with due care & attention.
Lighting up times has seen some recent changes & if I remember right, lighting up time now, is "any time the sun is below the horizon". Not set times.