Thanks for that, Carpenter. My problem is that we're just renting this place, the chap that wrecked the door is currently Down-Under (so we can't get any money off him), and apart from it being unfair to the owners to leave it like that, we don't want to put our own deposits on the line either.
Thanks for the correct "name" for that type of door, it'll be of help with my next round of phone calls. Do you know whether building suppliers only sell to trade? If not, it might be my next option.