.... so I left it a few days, until today, a cold -1 in the "open garage", trying to muster some enthusiasm; firstly reset the valves.....no go. Bear in mind, the cause will usually be an insignificant defect.
Then change the points/condenser, as thats most liklely.....no go. Really needed another person to crank the car whilst I looked at the spark plug, but no , wife was out.
I look into the fuel dept, and having some fuel from Esso with free sand in it a while back, I took to the airline and blew through any crud that may be left, only a few grains of sand , but thats all. Put it together again........no go

Wife returned; " crank the car over please whilst I have a look back here"...........no spark. By this time it was 1 P.M. And I had so much planned.
Lunch. ...........Out with my "sticky" meter, yes , the needle has decided to stick a quarter up the scale. .Ignition on , put the probe on the plus , other probe on -, no reading, ie not being energised. Out with the ign switch, thats fine including the wiring.Change the coil.........no go

.......So the blue positive wire to the coil is suspect, sure enough, the blue wire had been soldered but had no continuity from where the insulation had split up to the coil, a distance of 3cms. Crimp a new wire in place......Brummm, brummmm, she runs like a dream

As I said, was a simple solution, but finding the cause is the interesting bit.Mike. (i blame the cold)