Really?
The most recent protest I can remember was at Heathrow which has excellent fencing, but didn't stop protestors getting on top of a plane.
If anyone is determined to get onto an airfield how much planning does bringing a pair of wirecutters need?
The issue about permanent police presence is in my opinion a more sensible one, but at the end of the day the cost will get measured against the risks facing a small regional airport.
I think it's press scaremongering of the sort that the tabloids and Channel 4 love to indulge in.