We have a Scammell Low Loader like the one shown on this page (although ours is real):
http://www.classic-combines.com/lowloader.html
We believe it was a Pickfords, and it has a 5th wheel coupling, not a Scammell hitch.
It is structurally in good condition, but there is no paint left on it, tyres, brakes, mudgaurds, lights etc in need or repair / replacement though.
Any ideas on what it's worth?