How much money has England spent on the 2012 Olympics?

Answer 1

At the time of the opening ceremony, Wikipedia mentions £11.5 billions, from the original £2.4B at the time of the bid, revised to £9.3B in 2007.

In June 2012, the British government latest report said that it was on track for its planned £9.3B, even a bit under, but a parliamentary committee warns of a total cost that could amount to £10.9B, which include recent additional security costs.