No, car is immaculate. The windows are tinted, and I've fitted black badges, so possibly that's why.Did your photos show any damage or anything? I would expect (and hope) that the estimate matches the offer if there is nothing obviously wrong - e.g. scuffed wheels.
I have now run the trade in quote again, and they are now offering me £700 less than Friday, so maybe that explains some of it, but still about £270 deficit.