Ignored the Disco and tried to find out why my daughter's Daewoo Matiz wauldn't fire up..When I went to plug a diagnostic lead into the port there was already a lead plugged in. I unplugged that and the car now runs fine. Turns out it is the insurance black box. Phoned them and they said it is OK to run with it unplugged until they come and sort it. I will ignore threatening emails. The spark plugs, OBD scanner and spark tester tool will come in handy again probably. The wonders of big brother.
I hope you told them it cost you £50 at a garage to find out
J