A rat-catching cat is due to start work at 10 Downing Street after a rodent was spotted by live TV cameras twice last month.

Prime Minister David Cameron has agreed to taking on the cat after apparently talking to his two elder children Nancy and Arthur.

The cat is reported to be a four-year-old tabby named Larry from Battersea Dogs and Cats Home.

Rats have been seen on national television scuttling behind journalists as they reported from outside No. 10.

A professional rat-catcher was recently papped setting traps and putting down poison.

The rats are believed to be living under a bush near No. 11, where Chancellor George Osborne lives.

This is the first such feline appointment at Number 10 since rat-catcher Humphrey retired in 1997 after Tony Blair moved into Downing Street.

The famous cat, named after a character in comedy show Yes Minister, lived at No.10 while Margaret Thatcher and John Major were Prime Minister.

He retired a few months after the Blairs moved in because Cherie was not keen on the cat.

“I can confirm that we are getting a cat tomorrow,” a Number 10 spokesman said.