How do the Tories stop the rise of an ever-bigger state?

When Gordon Brown raised National Insurance in 2002 to put more money into the health service, it was seen as a huge political gamble. The Tories — including one Boris Johnson — denounced the move in furious terms.

In a sign of how far to the left the country has moved, the Tories are planning to do something very similar to cover the cost of a social care cap and dealing with the NHS backlog. If the Tories do this, it will put Labour in a tricky position. How do they respond when a Tory government raises taxes to put more money into the NHS?

But there is a political, as well as an economic, danger to the Tories in such an approach. Ahead of the announcement in the autumn, what remains of the low-tax Tory right will mobilise against the proposal.