Henry Bruce Welcome to FT
Do not buy from BA (=fuel surcharges) Try Cathay
Don't start in LHR. Buy a seperate LHR-AMS and start in AMS.
Many here on FT start DONE* in AMS or DUB to avoid BA surcharges and/or
UK Air Pasenger duty
You may get a better deal using point to point instead of LONE3. Look at TA web sites; Trailfinders or equal
MM LHR-AMS-HKG-RGN-HKG-BKK,SGN-NRT-HNL-LAX-JFK-LHR