Williams has a 2015 Plus 8 manual in pearlescent white, with side pipes, Speedster wheels and 4,500 miles for £94,995.
Looking around the web there isn't anything for less than £75k but nothing over £100k.

I suspect the last generation Plus 8s, have plateaued and are starting to rise: they are the end of an era.

Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...