Britain's 30-somethings should take to bed to solve the pensions crisis, the Tories have said.

In a pamphlet for the Centre for European Reform, shadow work and pensions secretary David Willets said that Britain needs to produce more babies to stave off a demographic time bomb.

The pensions crisis has not been caused by people living for too long, he argues. "The problem is that there are not enough young workers coming along behind," Willetts says.