Just ran a search on 'olympic'. It came up with surprisingly few sounds from the London 2012 olympic events or the olympic park.
If anyone has recorded any sounds, please upload. I would be interested to listen to those and they can also be important historical records - so lets have them on Freesound, please!
Also, now that the Olympic Park is empty and turning into a construction site again, I wonder what sounds can be recorded there now?
Have you tried the London Sound Survey?