Thank you everybody - really encouraging responses from you all, and very much appreciated.
I spoke to the insurer (NFU) yesterday - they are open to the options of me buying salvage and they are going to ring me tomorrow after they've spoken to their engineer.
I suggested they bring it here too so that I could more fully assess the damage, get 'further quotes', and save them storage costs ...... See what they say to that.
It all depends on costs I guess. But there is potential for me to finish it with a cat D to drive and have had some money to rebuild it (and maybe even a bit extra to chuck at my series 1).
I'm not sure at all at what value they will put on my 90 and what cost they would put on the salvage yet.
If it works out cheap enough to take the salvage, then I'd buy a super cheap car to run around in and take the pressure time pressure off fixing this.
So hard to value 90's - mine was 2000 but 80k and very clean and well looked after - I see later ones that are sheds in comparison but almost none of its age that are as tidy. A point I'll probably have to argue with them.
I'll post up the outcome.
Thank you again.