Pakistan has lodged an official protest over remarks by the British High Commissioner to Islamabad.
Robert Brinkley was quoted as saying that President Musharraf should quit as army chief and hold free elections by the end of the year.
A spokesman for the Pakistani foreign ministry, Tasnim Aslam, said the remark was unsolicited and unacceptable.
The British government has said that exchanges between the high commissioner and the foreign ministry were private.
Mr Brinkley was also quoted by several local media outlets as telling reporters in the eastern Pakistani city of Lahore last week that democracy in Pakistan also depended on an independent judiciary.
President Musharraf is facing growing protests over his decision, last March, to suspend the chief justice of the Supreme Court.