Well that was easy and cheap to fix. It was the Edis, but not in the way I'd thought. Had some time this morning to take a look at the car. Tried it to see if the car fairies had magically fixed it overnight, but no joy. Connected the laptop and checked that the microsquirt and its sensors were working. Span the engine over on the starter and the laptop showed a crank signal coming through.
I then pulled off the EDIS plug and noticed a bit of corrosion in one of the terminals. A quick squirt of contralube in everything and I reconnected it. Turned the key and VROOM :yes: . Just for good measure I contralubed all the other connections on the ECU drop down panel under the dash. It is something that had been on the "to do" list for a while.
The road that I was on is between Strines and Midhopestones, just outside Sheffield. It is picturesque, but extraordinarily bumpy in a Westfield. I think the tarmac is just spread in a thin layer over the rocks of the original track. Reckon the vibration must have disturbed one or more important connection in the plug/socket interface.
Good to go again!
Jen
(A good job I didn't win the EDIS auction on Ebay last night!)