Downing Street has denied David Cameron told an SNP to "f**k off" during angry exchanges in the Commons on Wednesday.
SNP MP Angus Robertson tacked Cameron over Scottish independence during prime minister's questions. The end of the prime minister's reply was inaudible, leading some amateur lip-readers to believe he had sworn at the Scottish nationalist.
However No.10 insisted that Cameron had, in fact, asked Robertson: "What are you frightened off?"