Sorry to see the extent of the damage John, having just had a similar experience, although not as serious as I can still drive my Roadster, have to say I have been less than impressed with Hiscox response, although Headley have been good. Wish I had taken up the offer for the third party's insurer to handle the claim, (they would have allowed me to nominate my specialist Morgan repairer), it would have saved a lot of phone calls & frustration.
Hope it gets sorted soon.