Last Thursday, Sadiq Khan announced that from April next year there will be 400 more firearms officers in London. ‘Nothing is more important than keeping London safe,’ the mayor said in his first major announcement concerning the capital’s policing. The Metropolitan Police commissioner, Sir Bernard Hogan-Howe, had asked for more armed police after last November’s terror attacks in Paris. On 1 April, Downing Street announced that £143 million would be spent on ‘increasing the number of specially trained armed officers’. But senior figures in the police are telling the BBC that still isn’t enough.