Dear Numog, had a look at the "reset" button. A well sealed unit which I carefully checked around for any signs of water etc, nothing found. Also checked around the area where the button is situated plus upto the the junction on the wiring loom, again no evidence of water. Sunday was a glorious "open top" day in Scotland so I went for a run - switched on and the speedo went into calibration mode but after a short while reverted back to speedo working ( normal calibration mode if the reset button is pressed in when switching on). After the car had stood for 1 hour started it up again : same thing happened. The moggie is due to go to the Morgan agent for some work so I will ask them to look at this problem unless I get any further suggestions that can solve it.
Thanks very for help
