If you download the PDF, you will see a booklet giving info of airports within 2.5hrs drive of London and gives basic details of the airport, facilities and what traffic they could handle...
Made me smile how they have listed small airports like Sywell, near Northampton/Wellingborough about 2 miles from where I live. Also they reckon airports like BHX and LTN are capable of handling the A380!
If an A380 landed at LTN, on its 7000ft runway, not sure it would be able to get airbourne again, and remain at the airport as a museum piece!
Also seems LHR is out of bounds for all additional traffic for the Olympic's, and traffic will have to use other airports. I think STN is going to be the massive winner here, being the nearest major airport to the Olympic village. It has seen its passenger numbers drop in recent years, meaning there is quite a large amount of spare capacity, a 9,000ft + long runway and good infastructure. Other airports I reckon will benefit will be SEN, LTN and LGW.
Southampton and Bournmouth should do well, with the sailing all taking place on the south coast near Weymouth.
Even though airports like EMA and BHX m ight seem a long way from London to benefit from Olympic traffic, it is conceivable olympic teams might fly into these airports, as a number of countries are basing their training teams in the Midlands. For example here in Northamptonshire, it has been talked about the Indian swimming team might be based at Corby to benefit from the new East Midlands International Swimming Pool that recently opened.