Thanks, my Dad used to work in the insurance game so he's helping us on that front.
We know it won't go anywhere but we'll be instructing him that he must claim on his insurance when we have an idea of overall damage this weekend. He's the only one who can claim as it's his policy, but we will be copying in the insurer when we do it.
We expect no response from him as he's got his head in his arse and hasn't responded to any of our communications so far.
After that there's the 3rd party rights against insurers act, but only after his company is wound up (which he's trying to do).