The claim was made after President Asif Zardari told guests at a private dinner that foreign countries had played a key role in brokering the deal which allowed Mr Musharraf to stand down in 2008.
Mr Sharif, a former prime minister, has intensified pressure for Mr Musharraf's arrest with a legal and political campaign for him to be charged for imposing emergency rule in November 2007. The country's Supreme Court has already declared the move unconstitutional.
Britain has always denied it played any role in General Musharraf's resignation deal or talks to spare him from treason charges, although its diplomats have told Pakistani officials that any trial would be divisive and a distraction from the country's frontline role in counter-terrorism efforts.
"Britain has been an interested observer, not an implementer," said one Western diplomat.
But sources close to Mr Musharraf have alleged to The Daily Telegraph that David Miliband, the Foreign Secretary, and Sir Mark Lyle Grant, a former High Commissioner to Pakistan who was recently appointed as Britain's Permanent Representative to the United Nations, played lead roles in brokering an "understanding" over his resignation.
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