<P> 10 Downing Street , colloquially known in the United Kingdom as Number 10 , is the headquarters of the Government of the United Kingdom and the official residence and office of the First Lord of the Treasury , a post which , for much of the 18th and 19th centuries and invariably since 1905 , has been held by the Prime Minister . </P>
<P> 10 Downing Street , colloquially known in the United Kingdom as Number 10 , is the headquarters of the Government of the United Kingdom and the official residence and office of the First Lord of the Treasury , a post which , for much of the 18th and 19th centuries and invariably since 1905 , has been held by the Prime Minister . </P>
when did 10 downing street became the prime minister 's residence
when did 10 downing street became the prime minister 's residence
1905
1905