@ Moonym20, you have all my solidarity, even if I would not like to be in your shoes, as it is objectively a very difficult situation.
For what it is worth, I can tell you what happened to me 4 years ago: without going into the details of that specific episode, the bottom line is that I had placed a claim with my insurance for a minor damage to my car bonnet caused by a tipper truck driver who decided to offload part of his debris on the road. Unfortunately it was essentially his word against mine, which is why I then decided to buy a dashboard camera.
The point was that even if I had told very clearly to my insurance (Allianz / Audi Insurance) that I would have proceeded to repair the paintwork only if the counterpart had admitted full liability, unfortunately my claim was still open when I got the annual renewal notice… which was 50% higher! I then decided to cancel my claim as it was more about a matter of principle than any actual damage, but to my surprise the renewal premium would have still been 20% higher, officially on the basis that “since I had been involved in an accident anyway, I would have been considered a riskier driver”. As you can imagine, I challenged the insurance customer care agent to explain how I would have been more likely than anyone else to cause an accident on the basis of the fact that once in my life my car had been hit by debris while I was behind a tipper, but all he could say was “I see your point, sir, but this is our policy”. I then explained exactly the situation to Natwest Insurance (UK Insurance) and they had been more than happy to insure my car at a slightly cheaper premium then the pre-accident quote from Audi Insurance.
In your case, as all the other members suggested, you should get your own copy of the CCTV video ASAP. If you cannot go now, at least give the petrol station a call straight away and ask them to keep the evidence until you can fill in the form, pay the admin fees, etc.
Once you have evaluated the video footage, if you feel that you can unequivocally prove that it was the other guy’s 100% fault, I would suggest you to stay with your current insurer (as it makes things easier), pay a higher renewal premium now and then claim it back on your counterpart’s insurance once you can prove his liability. If otherwise the video footage is ambiguous and the claim is going to look like 50/50, then I would cut the losses, shop around and get your car insured elsewhere. Of course, you will still need to mention that you have an open claim, but other insurers might be willing to make you a good offer just to get a new customer.
Good luck and keep us updated.
Fab