David Cameron has two weaknesses, it is said. One is that he has few detailed policies; the other is that the policies he has are contradictory. For example, he is against "big government" but cares about poverty, which implies expensive state action.

I bring news from deep inside the inner workings of Team Cameron. There is more policy work going on in the engine room than is visible from the outside. One policy in particular is intriguing. That is the plan for a National Citizen Service for all 16-year-olds.