there it is. reporter: from number 10 to number 11, rats scurry across downing street, no political metaphor intended. my god, it s properly, properly they re big and aren t shy and seem to like being on tv. ignore me and look left. andy carlson still has a few more week of work left. they are looking for his replacement. yes, downing street has a rat problem. dead ones found on the grass, live ones scaring the policemen, reporters are a little braver. perhaps the rat-catcher s been a victim of the cuts so we took our own. any rats coming along, as far as they re concerned, this is food. they re going to eat it, they re going to die. reporter: is your advice to get one of those stuck outside? or two or three or four. shows you, doesn t it, no one s exemp. we ve got probably one of the most secure environments in the whole country, and, you know, unless the the police officers start using their guns for something else maybe, i