Since the slaughter in Woolwich, people keep asking the same question. Will it change things? On the basis of the last week I can say: ‘No, not at all.’ Some more members of the public will recognise the serious and malignant threat that Islamic fundamentalism poses. But among our politicians, there will be no change. Not only because across government and across all parties there are people who believe there is no problem — but because there are so many people and powers in place to stop this country doing what it needs to do.