Not really a tech/ops q but im happy to answer it for you
777s are by default based at LHR
, thats the YMM? registered ones.
777s are mixed between LHR
. There are the following LGW
based ones (AFAIK and from memory, but they can change all the time):
G-VIIA, G-VIIB, G-VIIC, G-VIIR, G-VIIO, G-VIIP and either M or N
I know G-VIIG, G-VIIM, G-VIIS, G-VIIT, G-VIIU, G-VIIV, G-VIIW, G-VIIY and G-VIIX (no G-VIIZ or IIQ) are based at LHR
. G-VIIK and G-VIIL have been at LHR
a bit recently following their repaints from their World Tails too. G-RAES and the G-ZZZ? ones are also LHR
based (these are the non-IGW models with less powerful engines).
Basically, if I've confused you...RRs from LHR
's from LGW
although there are about 8 LHR
Hope this helps?