Ok. Good news is that I got into the car and charged the battery, took it out for a nice long run.
However, a new issue.
I have a continuous fast flashing red light on the dash displaying the car with a padlock.
The manual says this is a security indicator: "the key has not been registered with the vehicles on board computer.!
What the heck is it on about and how do you stop it flashing?! How do you register the keys with the on board computer??