Just wondering why the Heathrow zone is class A and not Class D.
You can keep the heli-lanes and their routings but when an aircraft deviates from them close in to EGLL (inadvertently or on purpose)you haven't had an automatic loss of separation. ATC still controls who can come in and out of the zone so it wouldn't mean a free for all.
When CAT A traffic (police or helimed) needed to get to sites within 3 miles of the approach or departure tracks it was a nightmare...and always seemed illogical.
I am presuming it has been requested in the past to be changed? Any plans for this in the future.