It all depends on.... what mileage it has, service history, extra's and condition.
It also depends on what you want/need for it
if its any help, I bought my Wee last June, 35,000 57 plate, needed some cleaning and paintwork, but was OK to ride, full service history, just a bit battered, paid £1450 for it, then sold panniers and racks for £100, so all in £1350. BUT have spent a few bob on it.