Somebody cut in front of me causing me to bump into his car, what do I do now?

I had a bump a couple of months back. A boy racer was driving dangerously at the side of me and took over on the inside and cut in front of me causing me to bump into his back end. The police were called and I argued that I was not at fault. Accident happened due to his dangerous driving. He pulled in front of me and slammed on his brakes causing me to bump into the back of him. He was in a company car. I took the blame because I went into the back of him and at the time I didn't realise there was any witnesses. There is also a camera on the road it happened on so I might be able to find out if there is any evidenci had a bump a couple of months back. A boy racer was driving dangerously at the side of me and took over on the inside and cut in front of me causing me to bump into his back end. The police were called and i argued that i was not at fault but he sae of the bump to prove he was at fault and not me. But not sure how to go about doing this.