After a few days of Kurt starting and stopping I think I finally found the cause. I think it was bad wiring left over from an old alarm system. Using the wiring diagrams I found all the wires connected to the ignition coil. I traced these to the Fuse/Relay box (pink and red wire) and under this the supply wire had been broken and reconnected to an alarm system.
The alarm was subsequently removed and as the supply for the ignition coil was broken, the guy just stripped back the insulation on the extended wires and twisted the two wires together!! The connection was all corroded, you know the story!!

I clipped the extension wires, resoldered the original wires under the fuse box and put some heatshrink on. The car has started no problem and doesn't miss any more.
Fingers crossed!!

gerard