Evening, apologies for the lapse of time; unforeseen events demanded my attention elsewhere.
So, to pick up where I left off.
Had the coil, distrib, batt & alternator all checked out.
Everything came back fine.
Local shop has a test book- codes came up as 'power train' failure, with sub links advising to check the inertia switch & fuel pump for intermediate activity.
Long story short.
The fuel pump was at its end and sending signals to stop fuel delivery as if I had an accident.
Pump & filter replaced... I'm back on the road!