Even though you have not committed a criminal offence (Police officer saying not your fault), then it doesn't stop a civil claim being brought against you. Beyond all reasonable doubt vs. balance of probabilities
In 2003, whilst driving a car I was involved in a similar collision with a pedestrian. A young lady decided to run across the road and didn't see me in the right filter lane. I was only going 10mph as I was coming up to a red traffic light, but she hit her head on the windscreen and fractured her skull. She was in hospital and had amnesia for 3 weeks prior to the accident. The police investigated the accident and I was not found at fault. However I had a pending claim on my insurance for the next 5 years should the lady decide to sue me. Luckily she didn't.
So to cut a long story short, I would speak to the CTCs solicitors. You don't want to get sued