The whole 'security' argument of this proposal is hopelessly flawed. It is typical of many so called 'security initatives' as it smacks of looking like something has been done.
Virtually prohibiting light aircraft from the huge zone achieves virtually nothing as the effects of crashing a light aircraft on a house is to break the windows and dislodge the roof tiles. Load it with explosives and it makes a white van look like a much more effective delivery tool.
And yet for this 2 month period potentially much increased scheduled traffic into Stansted, Luton and London City, Heathrow and Gatwick will all be within a couple of minutes of the venues - what represents the real security risk?
The risk assessment to justify the restrictions will never see the light of day as it would exposure the authors to complete and utter ridicule!