Access to airspace is being addressed, again through procedural AND technological means.
I remember talking to some bods at DERA in the late 90s who were in discussion with the CAA on this very topic. I'm amazed its taken so long to sort this out, given the advances in technology (TCAS, DGPS not too mention our ATC infrastructure) and thinking on the topic.
Their application in the military arena has already reached a level of maturity and sophistication, unlike their application for civilian uses. As for the UK police using them, I'm not holding my breath.