I know a little about this one. I believe the guy bought it off ebay from DK for just under £2000 so there is probably a little room for negotiation with him.
I recently got a price for bringing a bike up north by courier. Best 3 prices came in at £150 so that’s a good ball park to work with.
On the anal side it is a B3 model. Ignore the picture of the B2 owners manual.
It does look quite a nice bike but I would have to change those silencers . . .