I have just booked a weekend at Cromford waiting room in Derbyshire, which has been wonderfullly restored to a holiday let. Really looking forward to it as it's close to Peak Rail and Ecclesbourne I think, and I've never been to Derbyshire.
http://www.cromfordstationwaitingroom.co.uk/
Also I just found out its claim to fame - it was on the cover of an Oasis single...
http://eil.com/shop/moreinfo.asp?catalogid=68690