Turnandburn's version is consistent with what I heard from a very senior LHR based STC. He has already been offered the 777 course. I believe they will go to primarily or all 777 in LHR. They may choose to augment this with -8I or A380 if they get them and need more seats. Also, I heard the LHR freighter may be cancelled so they can run a 5th pax service. Worth considering that 5 777 pax flights could carry about 20T each (100T total) worth of freight. Perhaps satellite airports such as Gatwick and Manchester factor in as well.