Thanks for the replies.
Well, I could not find any other solution than to smash the window! As soon as I had power to the battery the door lock worked with key in the hole and with the remote the key fob. I've never experienced a door lock that wont work with a key until its powered! Replacing the window was fairly straight forward and worst part was clearing up smashed glass. Taped the window up before smashing it but still get loads everywhere. Will replace the battery now.