ok so that's two loud beating heart sessions tonight now - but I've sussed them both.
1. Try to start the car and key won't turn and it just beeps at me - doh, it's cos the steering lock's on.
2. Go to mini bank - no i didn't need any money right now but I wanted to pose in my new car. Get back in car, turn key - nothing! I'm sat there for about 3 minutes thinking f*** - this has got something to do with the water. Try again, no luck, and again, same. Just really starting to have palpitations and then decide to poke the little stick in the hole (immobilizer) and hey presto - we have ignition! Although I hadn't locked the car cos the hole in the wall was right next to it the car obviously immobilised itself. Crapped myself for a minute though.
I know it sounds daft but if you dont know you don't know! Now I do!
Took my dad out for a spin on a nice long empty road earlier and he was well impressed!