Thanks for the reply Deejay, nice to know the model and I guess I am on my own when it comes to parts, but that just adds to the challenge. Fortunately these machine are robust in their construction and last a lifetime if maintained. My first dilemma was to get a replacement clutch lever, the old one was worn to the point of being almost inoperative. I haven't been able to track down a genuine replacement and so have fitted a mountain bike brake lever (see my photo) as a temp. It works like a charm but doesn't have the hold open locking device on the original lever that you can see in your photo.
The fun continues....
