Rishi Sunak has joined the long line of prime ministers who have declared that enough is enough, and the country must act to root out Islamist extremism. His speech from the steps of 10 Downing Street on Friday was hailed in some Conservative quarters as ‘striking intervention’. Nevertheless, the sceptic might wonder why it’s taken the Prime Minister until now to face up to the fact that many Jews do not feel safe in the British capital.