I think i have this problem or very similar. Its very on / off though, sometimes it will start sometimes it wont. Its quite scary though when your in a car park 50 miles away. I can just go to the car too start, turn the key (all lights on ignition) next turn to start and nothing, no clicking or even trying to turn over. I turn off, try to start again and its perfect - starts immediately. But then the next day i try too start and its just all ignition lights and no turn over.
Ive checked all the fuses; all ok.
Ive removed every relay, some where a little corroded so Ive cleaned and 'sas ed' the ends.
Any ideas on what too look at? thanks