Ah the benifit hindsight!
Not OPs problem at the moment, but I'm sure he'll look into it, in the future
Moving on...
OPs car could easily be worth 2 to 3k, possibly more, but who knows on the day!
I would go down the cash in lieu of repair route, where the insurance company would agree a price to contribute to repairs, without the car being written off... Which is something I'd push for all day long, getting your car back as a cat c/d is a costly ball ache!
Be very kind to the insurance engineer, and he may sympathise with you and work it in your favour, without it being written off
Thom