Thanks for the info! PEK and PVG are possibilities I hadn't considered. Updating the available choices along with the New First % (from http://ftdashboard.net/overview/baflights.htm)


BA 8 (HND-LHR) on a 777 (6.25am - 10.35am), NF 100%
BA 10 (BKK-LHR) on a 747 (12.20am - 6.25am), NF 57%
BA 12 (SIN-LHR) on a 747 (10.55pm - 5.00am), NF 100%
BA 16 (SIN-LHR) on a 747 (11.25pm - 5.30am), NF 40%
BA 26 (HKG-LHR) on a 747 (11.15pm - 4.50am), NF 100%
BA 168 (PVG-LHR) on a 777 (8.40am - 2.05pm), NF 100%
BA 38 (PEK-LHR) on a 747 (11.15am - 3.00pm), NF 83%