Hi All,
I'm pretty sure there is another filled hole on the head tube, so the original badge would have been riveted on. I also measured the rear dropout spacing as 120mm.
The Photo above does look quite alike, however there are a few subtle differences with my frame. For one, the forks are different, and also the head tube on mine is much longer.
Also, looking at the brochure page for the Olympic Sprint model, it should have different dropouts on the back so I'm not sure that bike is even an Olympic Sprint:
View attachment 351820
I've spent ages staring at photo's of frames on google and the one thing that stands out is the design of the fork crown on mine seems not to match most of those I see elsewhere. Perhaps if I can find another bike with the same forks I will have a better idea of its age! Thanks for the help so far anyway!