Mine's just developed an odd fault. If you turn the key to III all the accessories shut off like you'd expect, but the engine doesn't crank. It's exactly like it thinks it's not in N or P but the dashboard says it's in Park. If I jumper the starter relay, the engine will turn over but there's no spark at the plugs, presumably because it's "too smart" to fire the ignition if it's not actually being started on the key? Although that being said, I thought you could bump start manual V8s, so that kind of makes no sense. The ignition switch seems to deck the appropriate pin on its connector.
It's too dark to really check if all the supply rails are present but that's my next port of call.
Any other thoughts?