Dave, you haven’t said what spec your car is, Coupe, Sport or Sport Plus, ML sound etc.
Personally I think people spending this amount of money especially in the second hand market want top spec, even if it does cost a couple of £k more. I know I would as I’ve been looking for ideally a 21 model year, top spec, Red Sport Plus for a while but they are like hen’s teeth.
if yours is top spec and is as you have described it I would be very surprised that you would be struggling to move it on ?