Update on this problem. I had a starting and running issue a while back and thought it was the ignition switch connecting block above the cubby hole in the dashboard, because when I pulled the connecting block down the car would start and run properly. Anyway, having removed the block and put spade connectors in it's place the problem didn't go away, so I bought a new ignition switch that only had 4 wires where as the switch on the car had 7 wires and only 4 from the harness. Having spoken to Mark Gray he told me my switch should only have 4 wires as there are only 4 coming out the harness so I went with that. All fitted and connected up now and I now have a fully functioning Ammeter as well. So the fault all along was the ignition switch.
Regards Terry H