I am Keith Coppell's daughter Paula, i'd be interested in whatever information to manage to find on this bike, if you could give me the serial number, i may be able to give you some information about when it was built unfortunately dad didn't keep all the records from when he was making frames for very long after he retired, but i may be able to give you a rough idea.
Unfortunately dad passed away last year so I can only give you a rough idea.
Well I bet you didn't expect Keith's own daughter to reply! I certainly didn't. Thanks Paula, welcome to the forum condolences for your dad.
Frame looks great and could build into something nice and versatile with it's slightly longer wheelbase and mudguard eyes. Vast majority of parts are far newer than the frame and certainly not what would have been fitted from new.