Its too late now, but I would have mandated ALL non-military light fixed wing and helis to be repositioned from their private sites to designated airfields for the period. Then NOTHING moves without an airside personal clearance from security. There's got to be a better way!
I suggested something similar on this site a year ago, some thought police would not have resources to administer it.
However, terrorists may not be deterred
Has any advice or tips been given by police to UK pilots about countering the threat of hostage taking?
If there was/is such a threat it may not have been deterred by ground to air missiles, fighter jets or restriction zones.
Mickjoebill