Blumbly, Thanks for fixing the picture.
So it's a 1972 model.
I've had it a long time and it doesn't get much work, and I can't remember where I got it from.
I will check the spark.
OK. I just took the plug out and checked the spark expecting there to be none.
However, there was quite a good spark, I wouldn't say bright blue, but bluish yellow as far as I could see. So I put it back in and it started! After trying for a couple of weeks without a kick!
It's sounding a bit rough, so it might be an intermittent fault Perhaps the condenser is faulty. I will try it again in a few hours.
I've decided to pull it down and re-paint the cowl, base and handles.
I live near the coast and it gets condensation on the top surfaces in the winter, even though it is stored in a shed.