At last we found (& fixed) the problem!!
Richard you were very close with your suggestion. Approx 3 or 4 inches away from the the 20 pin dash loom connector (white) there are 2 diodes soldered & heat-shrinked in line, one into the green/red cable (lhs indicator signal) and the other into the green/white (rhs indicator signal).
The lhs (green/red) one had blown. This meant that when I signalled to go left the circuit was 'back feeding' the other side as well. The diodes act as a sort of non return valve in the electricity circuit. New diode spliced in, problem fixed.
I've just got to put it all back together again now.
In searching for the root of my problem, I have noticed something that seems a little strange (to me anyway). If I turn on the hazard lights, without the ignition switched the dash indicators (green arrows) flash but also the red ignition symbols light (as if the ignition had been switched to start point). The car is not ready to start because the fuel pump has not been primed - doesn't start, I've tried.
Never noticed this before - have to say I've never looked really, does anyone else see this - or is it an anomaly with my early car?
Thanks again for all your help and suggestions.
Regards
Andrew
