i would use the argument that as it wasn't your fault you could demand the satisfaction of having it repaired to as it was condition, at the end of the day - uneconomical or not it's not up you to lose out as you are the innocent party here.
if they wish to write off the vehicle they will have to reimburse you with enough to cover costs of replacing the vehicle with an equivalent make model and condition looking at 2k if you pushed it from a
dealer IF you can find one - then your inconvenience - costs and loss of time earnings etc
they are writing it off as THEY deem it cheaper for THEM
what about you ????
i reckon anything between £900-£1500 with the car returned isn't bad and not registered if you can push it would be a bonus as you have to think what happens if 50% of your insurance quotes vanish as it's registered as a write off?
i would give it the mid conversation 'eureka' moment, as the conversation is stalling something like:
'HANG ON A SEC, did i drive into the vehicle? was it me that caused the accident and damage? NO!!! but why am i having to be the one with all the grief and inconvenience here?'
you gotta bitch a bit at these tightwads to get em moving
there is 2 slightly newer registered ones on autotrader @ £2050 + £2495 right now so £1500 isn't taking the piss by any means