Lexus will offer you 'book price' - so criminally low 🤣, but Lexus Swindon have always been keen on their F-cars, so maybe offer you something more respectable?
I know it isn't quite the same, but my GS F sold through Monza Motorhouse, Asim was lovely, responsive with emails, fair price and quick turn around, might be worth a shot. He also funnily enough has good connections with Lexus Swindon.