"Sorry I didn't see you coming up behind me" - what a ridiculous statement. You were blatantly rammed!

You have the evidence. Report the "accident" to your insurance company, which you are obliged to do, especially if you take it further (make sure you do things by the book). Hopefully he has exchanged details with you and notified his insurance company? If he hasn't, then he has broken the law for failure to report an accident (besides willful damage, driving dangerously etc etc.) Report him to the police and make sure a claim goes in against his insurance (if he has it) for something along the lines of new forks and front wheel.

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