Louise Mensch was one of 15 Conservative MPs who missed the vote on Jeremy Hunt. She was welcoming the Queen to her constituency in Corby.
MPs voted by 290-252 against a Labour motion calling for an investigation into Jeremy Hunt's handling of the BSkyB takeover bid.
Nick Clegg has laid bare a coalition rift by revealing that he wants the PM to launch a probe into Jeremy Hunt's handling of the BSkyB bid.
The Liberal Democrat leadership has asked its members to abstain in a debate over Jeremy Hunt's behaviour during the BSkyB bid process.