How much money is spent every year in the UK?

Kind of a vague question, but GDP would be a more adequate answer. GDP (Gross Domestic Product) is the total output of an economy over a period of time, whether it be quarterly or annually. This includes consumer/government spending, trade etc. Everything - the total value of goods and services produced by ALL sectors of the economy - it captures the whole UK economy in one statistic.

In 2010, the total GDP was valued at $2.246 trillion. It's pretty much hovering around that now, possibly a bit lower because of our economic climate (just part of it... unemployment is at its lowest in 17 years, approx. 2.63 million are unemployed now, therefore consumer spending is reduced because people haven't the money to spend and consequently our GDP will decrease).