I think insurance will try and settle it as 50:50 tbh but absolutely do not take this, you can push for it to be escalated to a different claims handler.
One of the accidents I’ve been in, MY insurance initially told me I was lucky the other side had offered 50:50(!!!!!) when he’d gone into me. It was at a sort of crossroads but a very wide bit in the middle where you have to sort of bear left if you’re going straight across (which is what I was doing), and he was perpendicular to me doing the other crossroad route and hit me from the left at the side of my headlights and pushed my bonnet out of line. Because of how wide the road was, he could’ve only hit me in that position because I was more than half way across the wide bit (when I set off he wasn’t at his give way lines, not even close, so I’d set off and he just didn’t stop at his give way bit, went straight into me, carried on down the road for a bit and stopped quite a distance away, probably due to the speed he was going).
I didn’t have a dashcam in this instance and I remember submitting lots of marked up diagrams and I really did push for it to be escalated as I KNEW I wasn’t at fault, and once it had been reviewed -properly- by the insurance they agreed it was 100% other side’s fault. His insurance claimed I’d hit him (impossible due to damage) and they wouldn’t concede, and we had to go to court. Very stressful but actually quite fun in hindsight; he was very combative and kept changing his statement and at one point actually said that he HAD seen me set off, when his statement said that he hadn’t seen me and I’d come out of nowhere and hit him. Judge found me 100% not liable and summarised that the other party failed to stop correctly at the give way point.
If it does get to court stage, all you have to do is tell them exactly what happened, which from your perspective won’t deviate from your original reporting of the accident to your insurers, vs whatever reason Green will rationalise as being the one to justify her having a pootle across to the hatches.
Very quickly to add (as that one was much longer than I anticipated, sorry!), I was also hit when a driver performed an unsafe manoeuvre because they were in the wrong lane after the above one, and luckily I had a dashcam after the above (which I can see you’ve got one on order! Fabulous). In this one, we were coming off a motorway where there are 2 left only lanes, 3 straight on only lanes, and 2 right only lanes. I was the second car in the right hand side ‘left only’ lane and the other driver was the first in the first ‘straight on only’ lane. My dashcam shows them setting off at speed and then braking in the yellow box, and I had set off as they did a very sharp (and illegal) left turn straight into my back passenger door (ie I was well established in my correct lane) and all along the side of our car before coming to a stop ahead of us having mounted the central reservation. She was very aggressive and was shouting at me to take a couple of grand in cash right now (our door and back tyre were written off along with other damage along the car, think it cost about £12k to repair). Anyway we had to ring the police because she was going OFF at me for not accepting the money, and then she just buggered off before the police got there. Turns out she was uninsured. Prepared lots of diagrams and submitted the dashcam (appreciate not available here) but this was found 100% non fault too.
With you reporting to the police, you might get a pack through the post to fill out so be very thorough, don’t be afraid to use the extra notes pages, and definitely include your diagrams. This will be separate to your insurance claim whereas mine was used with it being an uninsured driver, however if you get a crime reference number pass it to your insurers.
Sorry this is so long! Good luck!!