Thanks very much guys.
Thats really very helpful. (I will admit to hoping it was a hidden gem, despite the odds!)
But it fits, rides nice and smooth and feels more solid than any other bike I've been on. I think the basic service and elbow grease will be my main concern, with possibly the wheels soon.
Other than that I should probably start saving. I will probably leave this bike as a more long term restoration job.
Thanks for the advice!