I recall this being talked about before the recent security issue. I think the press are linking the two when a direct connection does not exist.
It's all class D there (no class A down low around London any more) so no-one should be in there without clearance from "Special" anyway so a restricted area does seem a bit pointless.
When I recall it being spoken about before the IFR arrival and departure routes to LHR were to be exempted.
Bit of a non-story methinks.