Thanks for the advise!

I've disconnected the battery and will wait for a few hours then will have a go at it again.
The trickle charger has been on all night, but still didn't do anything.

I've got the charger on the battery right now, but all other connections taken off. Hopefully that will somewhat reset the flipping thing!

If not, it will have to be towed to the dealer tonight, to their misery (excellect lifetime warrenty!)