Falcon is a British company who swallowed up British Eagle, Coventry Eagle, Elswick Hopper, Claude Butler and Holdsworth and lastly Dawes. Ernie Clements was their designer and his name was used on some of their mid to upper end models. Barry Hobans name was also used on some of their bikes. Judging by the braze on's that looks like an early 1980's to late 1980's frame. Possibly 1985 on judging by the paint job.The quality dropouts suggest a quality steel frame probably built out of one of the Reynolds tubesets. It looks like its had some newer non original parts fitted, saddle, shifter and rear mech. The chainset looks like a lower end double with the inner ring removed. I would tentatively guess that it was converted to a fixed or single speed bike before being coverted back to geared. It looks like this last conversion was done on the cheap as the mech and shifter are lowend bits. In addition the shifter is an mtb item and its placed in an unusual place, definately not done at the factory. Can you give us the frame number and details of any decals/stickers that may be on the bike, this would aid the more experienced members of the forum.