Car Accident Insurance Advice

Hi so basically today I was on my way home from work at around 4:45pm. I work in a hospital campus and travel through the hospital twice a day, 5 days a week. The hospital campus is horrendous, roàds are narrow and busy, parking spaces limited and buses going through means people often forget how to drive. I am saying this as being used to this horrendous place I always use extreme caution when driving through as people stop where they want, don't use indicators etc.
So I was traveling down the hospital road when someone in front of me was stopped near the kerb (a normal occurence) I hesitated thinking !!!!!! is he doing before indicating to take over him, no oncoming traffic etc and the road is straight. As I'm coming up the side of him he begins turning right into a parking space on the opposite side. I seen it happen in slow motion and knew we was going to collide. I braked but had nowhere to swerve to as I was near the kerb and a lamp post. As I came to a stop he continued to come into the side of me before hitting me, although the positioning of the cars we kind of hit each other even though I stopped before he hit me. So his right drivers door was against my left passenger door meaning he couldn't get out and his drivers front side was in my passenger front side. He is basically saying I drove into him as he was just parking and that I was on the wrong side of the road. He said because of this the insurance won't even give me a say (he took photos). My car would be a write off if my dad wasn't a mechanic and even at that it's not going to be cheap but I don't want to claim as i don't want to lose my no claims. The damage was to his was a company van with no apparent body damage but he couldn't drive it as the wheel had snapped or whatever holds it on. It couldn't be pushed either, completely limp from the wheel dropping. I have spoken to my insurance and they have said from what I have explained he is negligent as didn't check mirrors and that if he gives the same version of events he will be at fault. I'm just so worried as this has never happened before and I don't understand how it works or who's fault it will come across to the liability team. I told the insurance what he had stated I had done wrong and they rejected that I was in the wrong and basically said he doesn't know anything as he isn't a professional. There are no witnesses (it was a busy time and caused a blockage but no-one got out and I was too shaken at the time) and no dash cam etc. I'm just so worried with the cost of the damage as well as the whole insurance thing. His company hasn't made a claim yet but probably will Monday. So basically it was a side on side collision from me overtaking and him suddenly swinging into a parking space on the opposite side to where he was, so he must of only looked forward and not contemplated someone coming up and around him. I drive a 7 seater Zafira and his was a Ford Transit so they are around the same length (I could be wrong actually) they just seemed it at the time.
My damage is that the whole side wheel panel has been dented and dropped causing the plastic to fall down onto the wheel, smashed headlight and indicator, bumper damage, various plastic parts of the bumper snapped, dents in the front metal and side pushing into the light area, scrapes, scratches and chipped off paint work and leaking window wiper fluid from the bottom near the bumper.