buyers aren’t impressed that it’s had one careful lady owner and has been serviced regularly and is in great shape with low mileage
Nope they’re not, Most people buy used cars looking for possible pitfalls down the line, and ignore the seller’s rose tinted specs…
Rightly or wrongly people are going to “read between the lines” and interpret a careful lady owner, low mileage and diesel engine as indicating, school run and shopping short runs, with lots of gear changes and stop/start town driving from cold, therefore possibly requiring clutch/gearbox attention in the not too distant future plus being a diesel, maybe a clogged DPF?…
Why not knock £300 off the asking price and see what offers you get, or even try ebay/Gumtree?