The residency of the Chief Whips at 12 Downing Street ended in 2001, when Press Secretary Alastair Campbell was moved there from an office in 10 Downing Street by Prime Minister Tony Blair. The Whips were moved to 9 Downing Street, previously only known as the Privy Council building. During Gordon Brown's period as Prime Minister, he moved the Press Office back out of 12 Downing Street and instead used it as an open-plan office for himself and his key advisers, because it contained an individual space large enough for him and his advisers—something not available in 10 Downing Street.