Northolt (historical home of the Polish B ofB fighters) is 4.2nms N of Heathrow. On Easterlies there is a 30 deg dogleg turn at 3.5nms finals which provides 3.1nms separation at the closest point. When RW 23 was in use, a number of ac on visual finals for NHT RW 25 went for RW 23. Being aware of the problem, close montoring "caught" them before they strayed too far. Similarily, NHT would have to turn off RW lights between inbounds so as not to confuse LHR traffic turning for 23.
Question: Does RSVA apply?