( also No 10 )
1. the house at 10 Downing Street , the official London home of the British Prime Minister (although Tony Blair and his family in fact live next door at No 11, which is usually the official home of the Chancellor of the Exchequer ):
There has been a stream of visitors to Number Ten today
See also Chequers .
2. the British Prime Minister and the people who advise him or her:
The paper got its story from sources close to Number Ten.