‘We have to put it on the table and be honest about it. Of course there are Christian extremists and Jewish, Buddhist and Hindu ones. But I am afraid this strain is not the province of a few extremists. It has at its heart a view about religion and about the interaction between religion and politics that is not compatible with pluralistic, liberal, open-minded societies.’

He adds: ‘At the extreme end of the spectrum are terrorists, but the world view goes deeper and wider than it is comfortable for us to admit. So by and large we don’t admit it.’