Paul, does the engine start and run? The ecu as far as I can remember gets its signal from the distributor, the ignition side (ie spark) is separate from the ecu which is only for fuelling, try taking the ecu apart and re-soldering the transistor connections they usually show cracks in the solder (dry joint). If all else fails I have a complete set of parts for the flapper from my car that I kept when i changed the lucas system for something modern and more efficient (as well as full fuel and ignition mapping) PM me.
David Byrne