I am going through a similar issue at the moment, one of my transits was written off when parked, absolutely no disputes about liability etc.
I have to go through my insurers who appoint a claims handling company who in turn have to deal with the third parties claims handling company, I have a hired van paid for by the 3rd party insurers, not ideal as my vans are racked out etc, but something, it’s costing the insurers £600 per week.
They started off with a derisory offer, and have now nearly reached what I need to replace the van with a similar one, all the time costing them for the hire van.
This has now been going on for over 2 months.
They have had various adverts of similar vans but I can’t see this being settled before Xmas!
Be very patient & hold out for what you need, but be realistic.
Vehicle Insurance is a big con really, I just want a similar vehicle, nothing more.
Good luck!
Andy