You have had the most expensive bits done, belts, clutch, if your looking for £1250, I'd put it in for £1500. ovno. Those two items must have come close to that.
If it were me, I would try for more, say £1950 ono then come down a bit for the dings and paint, you can always come down on price, never up, but then thats me!!!
At £1250, people will expect you to let it go for £1000.
Best of luck with the sale.