I got knocked off last December, hope you have the drivers name, phone number/address and his registration? Name/number of witnesses as well. First step would be speaking to him to confirm his insurance company and if he/she has it a phone number. Many/any driver reporting this to their insurers will be told 'not to speak to you', but keep it friendly, don't place blame (unless already admitted at the roadside) and speak to the insurance company. You've already done the police side, use that incident number to your advantage - if you've reported the incident and the driver hasn't, immediately the Police are on 'your side' as that's the only info they have.
The guy who knocked me off was very apologetic and friendly at the roadside, freely admitting it was his fault. When I spoke to him later he was very cagey and wouldn't give me any more information apart from his insurers details. He got really defensive when I mentioned I had reported it to the police. I was more than happy to deal with an insurance company - it's in their best interest to get things sorted.
List out all the things you wish covered and their approximate (new) value which you can supply receipts/invoices/evidence for. Get a repair estimate from your LBS, speak to them about it and get them to not 'do you a deal' (ie charge their normal rates and spend time looking closely at any damage, especially anything carbon). Calculate how many days you have been/are going to be off work (get a doctors note if it's more than a couple!) and then calculate your approximate earnings lost. The insurers you speak to are not overly interested in what these items are or what the list contains, only the bottom line. They will already have a figure in mind, especially if their client has admitted fault. Mine had reported it to his insurers and they were expecting my call.
The personal injury side of it gets more tricky and that's where the solicitor may come in, depending on the conversation you have with the insurers, you could even ask them about the best route to take. I can't help you much with that as I didn't go that route. I was more than happy with the compensation side (new bike!) as I knew I was 99% ok physically and only needed a couple of days off work.
One comment/opinion - the insurance company I spoke to were very helpful (NFU) and as soon as I mentioned I wasn't after a personal injury claim they were amazing - I'd had money transferred to my account within 4 days of the accident. Although my bike was repairable, I spoke to my LBS as it was a cheap halfords bike and had done quite a few miles. Their quote for repair was near the shelf value of the bike £250-300. The insurance company agreed a 'settlement value' of double that taking all my other damaged equipment into account (bibs, gloves, jacket, smashed helmet, helmet light etc). I really feel if I'd have been wearing more expensive clothes and riding a more expensive bike I'd have had no problems claiming for more.
