Price has dropped by £200.
Because it was as is usual, overpriced secondhand in the first place!
Thorn bikes in my experience are half new price at best when selling secondhand. Old no longer made models are not worth very much at all, possibly because generally speaking, no size information/model details are available.
'jags' keep your Sherpa and just hope that you find work or money or both to buy your coveted (naughty) Audax Mk 3.
John