DennisK
I doubt if the terrorists will be bothering to file flight plans or obligingly 'squawk' prior to getting airborne with a 500 pound GP bomb
You're quite right, but does the CAA (Home office, whatever) believe that this measure going to stop them? If I was a terrorist, I could easily enter the London zone and be on the doorstep of the houses of parliament/Buckingham Palace, etc. in minutes. By the time the authorities even suspected something was going on, it'd be too late to do anything about it!
I think we should take it to Brussells - it's an infringement of our human rights!!