spikeair...yes, Saturday AM was a bit interesting to say the least. The normal protocol at LHR when operating on the Easterlies to land 09L and depart 09R - there is no noise abatement switch at 1500 Local for the Easterlies..However if there are significant inbound holding delays ( and we held at LAM for 30 minutes on Saturday) then ATC can use both runways for landing to get aircraft out of the holds and onto the ground. If that is happening most of the 09R landers will be inbound to T4, that gets them to the Terminal quicker and avoids them having to taxi across 09R, so helping the rate of movement on the ground ( well, that's how I understand it). No doubt an LHR ATCr will be along with more info.