Forget removing the plastics inside. Here's how to do it with the key. The boot lock only works via central locking when in the VERTICAL position. So get the key vertical when in the lock. Turn it all the way clockwise. Then All the way back anti clockwise, which will be past the vertical. Not turn it back clockwise to vertical. Remove the key and hey presto, open the boot. It actually says how to do it in the manual thing. lol. Mine has been shut for over two months coz i couldnt be arsed to do it.