Ok!
..MAY be some light at the end of the tunnel.
The new ignition switch made no difference.
It then occurred to me that some of the wires FROM the ignition switch looked odd as they enter the block behind the relay(s). Some, including the red power lead, have marks on them, the sort pliers would leave.
The yellow/black & red/black leads were'loose' enough to pull out, easily. I tried the yellow/black lead in the empty socket adjacent and the red/black likewise and the warning lights now come on when the key is turned to first position, and the engine turns over ( but doesnt fire) when key turned all the way to 'on'.
My question now, is , can someone supply me with a photo/point me at a diagram that shows the correct wiring of that block?
It also occurs to me that i may be missing a wire completely, one that links in the ignition circuit when the key is turned fully ?
Many thanks for all help
There is a solid black lead from the switch to the block, which i pressume was part of the alarm system.