Very interesting, and can only give you a few opinions/observations. On one hand I tend to agree with Neal that it could be an English 78/79 era Super Course. This is based on the Suntour rear frame dropouts, the seat post size, the seat stay and headtube lugs. However, the bar con dropouts are really throwing me=I believe that they just used a down tube clamp on guide. Also I do not remember English Raleighs having rack braze ons in the frame, located above the rear brake. I also thought that the SuperCourse had a 26.8 mm seat post diameter. Interesting mix, to say the least.