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Sound like dirty habits of the MPs that cause this by that article. My office workers know not to leave food in the open and if it left at a weekend or bank holiday it will be in the bins when they come back.
Chances are they are leaving foodstuff lying around - I've never heard of mice moving in anywhere and pooing where food isn't involved somewhere along the line.
As you have said Nom, the comments given are priceless (and one of the reasons I read articles that have public responses) - I loved:
'A call to order from Mr squeaker, i mean Speaker! might help..Order! Order!'