I think it is difficult to say without further information such as an accurate damage report and knowing under what category was the car written off.
Last year I bought back my Seat Leon Cupra after a prang. Insurance assessors said £2.5k worth of damage (under the way they had to repair it) and classed it as a Cat C. However they explained as they had to repair it to a certain insurance company condition, they had to replace parts that other places could/would repair. So a new bumper was £500 + fitting and painting! And parts such as the hub needed replacement. Whereas the bumper could be repaired and if an undamaged one was required then Ebay has them for <£100. And things such as the hub did not need replacing.
To get the car back on the road 100% fixed condition actually cost me £650 in total. And that wasn't me doing the work but a garage who repaired, rather than replaced. I was recommended this garage by the insurance garage who said it was daft not to get it repaired (elsewhere).
For anyone to want to buy it intact (unless it is for scrap) then folks will likely need to know the real likely cost of repair, and I guess they may need to inspect it themselves to do that. Good luck and I hope it isn't too much hassle.