It is no wonder that bank capital is regulated. When borrowing and lending is profitable, it is tempting for banks to scale up their operations and to borrow and lend too much in relation to their capital, in effect reducing the effectiveness of the potential capital cushion.

Once we are fed, heated, housed and healthy, our extra consumption inevitably has an element of luxury about it. And once luxury enters the scene, the practicalities are in trouble, as women who wear expensive stiletto heels can testify.

I've never enjoyed sleep as much until I got the 'Today' job. There is something about early sleep that's much better than late sleep. I feel myself going to sleep; I don't just plonk my head on the pillow. It's a sort of winding-down thing.

Even though disciplined sleeping habits and the adrenalin of live radio ensures that we are very awake while on duty, there is evidence of a phenomenon called circadian desynchronosis which causes one's brain to function slowly at those times of day when it thinks it should be asleep, regardless how wide awake the body is.

We Brits print banknotes out in Debden in Essex, and have contracted it out to the private sector. Here in the U.S. it is a government operation right in the heart of Washington next door to the Holocaust Museum.

Interestingly, human irrationality is a hot topic in economics at the moment. Behavioural economics it's called, on the cusp of economics and psychology.

Most people hugely underestimate the amount of 'empty space' we have in our country. Fly over the U.K., and you see that human settlement does not fill up the U.K. at all. It accounts for something of the order of 15 per cent of the landmass.