BORIS JOHNSON was accused of showing contempt for the public today after he missed a third Cobra meeting on the heatwave emergency to open an arms fair instead. 

Mr Johnson’s appearance at the Farnborough International Airshow in Hampshire could have been one of his final public appearances as Prime Minister. 

Most widely known for its aircraft displays, the event also sees weapons marketed to international delegations, with this year’s prospective buyers including the governments of Saudi Arabia, Qatar, Egypt, Israel, Morocco and Turkey.