Further to my post on Saturday:
There's A Mouse In My Kitchen, What Am I Gonna Do about our mouse problem at
The Gathering, I had some more steel plates cut to size and finished the job off by screwing them on to the store room door.
I've now placed steel plates along the length of the door and made sure they're as tight to the floor as possible.
On the corners I've bent two separate plates to fit with a flap sticking out to prevent any attempts at limbo by the mice.
I think I can say with confidence that I've won the battle here, and if they do chew through they probably deserve to be there.