Well, if I disconnect the battery, reconnect it, I get no Ignition voltages anywhere.
Turn the key to 'On', and I get all the usual voltages at the right places.
Turn the key off, and all those voltages stay until I disconnect the battery again.
The only reason I saw it was because my Low Fuel Light was on (I have disconnected all other warning lights for the moment)
Oh well, tonite could be a long fault finding process, or I'll just drive the car around for a while with a kill switch!