Putting to one side the issue of evidence, if you suffer a loss (be that financially or through injury) due to the negligence of someone else then they are liable for this. Imagine you're a car driver, someone pulls out on you recklessly forcing you to swerve to avoid hitting them. In doing so, you crash your car into a lamp post. Who is liable for this? The driver who pulled out on you obviously.
In the same way, if the car driver pulled out recklessly while you were cycling forcing you to crash, he is liable. This presupposes that you, as the cyclist, did everything you could reasonably be expected to do to avoid the loss (you weren't going too fast for the conditions, you weren't looking around daydreaming, your brakes were correctly maintained etc etc). If you had some element of responsibility then that would obviously mitigate any compensation you might receive