Seems like it's costing us EVEN more than we thought:
http://www.bbc.co.uk/news/uk-16036435

In light of this, let's work out some ways to save some funds.

I personally really love the idea that we just don't bother with this.

Literally fill a stadium full of the world's most (self) important people, turn the lights out for a bit then turn them back on to reveal Boris stood in the centre of the stadium wearing a last night at the Proms hat.

He'd probably say something profound like 'Er, ladies and gentleman and ladies... welcome... to Eton... no Londoninium! Games on!'

Then he'd light a sparkler.

It'd be better than a load of Morris dancers. And save us about £5 million.

What would you do?