BOAC
I take it you are saying that the heli-routes are exempt from the 500ft rule?
ShyT didn't say that.
Not sure why you keep mentioning minimum altitude
altitude?
Clearances for the heli-routes include
altitudes.
ShyT didn't say minimum.
it is less than 1000ft wide further east at London Bridge I believe, which makes 'opposite direction traffic' interesting.
I've never found it particularly interesting there.
You are permitted to temporarily deviate to the right of the route if necessary in order to obtain sufficient lateral separation from opposite direction traffic.
However, the increasing number of tall buildings further West is likely to make it increasingly difficult to comply with Rule 5 when VFR/Special VFR.
Also, under the current procedures, there are certain circumstances in which 2-way traffic along H4 may not be (legally) possible because of the new tower at St George Wharf.