I dont know how big the population is where you live, but I sold mine about a month ago locally, through word of mouth.
I informed my garage that serviced it, and other local respectable repair shops, as they are the places that people discuss changing cars, and tell them, there would be a drink in it for them.
I was lucky, sold mine in 7 days, to the first person that came to look, and I live in a small Town.
It saves on all the time wasters wanting to test drive,
phone calls, e-mails, texts, and dodgy people etc,
Also your local Gum-tree, or FB, but at £20,000, might be to much for them.