Recently purchased this frame on Ebay and when I collected it was told it was an old Raleigh. I googled this and it looked like it was a Raleigh Triathlon. Features which made me think of this are twin water bottle mounts, 531 tubing and cable mounts on top tube. However now its home and i can see it better it has the word Falcon on the top oval seat stay - one side only? I'm now not sure what i bought - happy as its light and in reasonable condition. I have googled Falcon 531 and there's nothing that looks the same? I will upload more photographs tonight if required. Original Ebay photo attached. HELP!