Behind the horror and revulsion at the slaughter in Tunisia there is also deep concern that the world is apparently being overwhelmed by acts of unimaginable barbarity. Three Islamist attacks — the beheading of a transport manager in France, plus the Sousse massacre and the human bomb attack in Kuwait by Isis — took place in different continents on the same day. Dozens of Islamist attacks have taken place this year alone — in France, Nigeria, Egypt, Pakistan, Copenhagen, Texas, Libya, Yemen, Somalia, Iraq and elsewhere.

Like other countries, Britain serves as both production line and target for this terrorism. Two weeks ago, we learnt that three Bradford sisters had fled with their children to join Isis. The head of counter-terrorism police, Mark Rowley, has