Hobbit does have a point, partially, because most other countries got so taken over by the olympic madness they shut down GA more or less totally for the whole period.
Not suggesting that is sensible of course, and I think a lot of the UK procedures are way OTT - especially the IFR slots.
I also think that the amount of olympics-related traffic which is "anticipated" is a figment of the imagination of the "business development managers" with their fresh University of Upper Warlingham MBAs. It's mostly bollox.