These guys were selling Singular Gryphon frames for £399.
http://edsigns-yorkshire.wix.com/edsbikes
I've a triple on front of my 6 year old Fargo, 9 speed with 11-25 cassette, gives large range but without the large jumps in rear ratios as i use it to commute on road.
Fargo is a fantastic bike, so adaptable, funny how Genesis are dropping Vagabond and Singular are dropping the Gryphon (despite trying to sell you the Swift as being drop bar compatible)?