You do live in a foreign country
Most flights we quote are based on LHR>MNL or MAN>MNL
You don't have to take what you are given. You can book a flight to say Heathrow yourself. Then book LHR to Hong Kong, then book another seperate flight to your destination.
You'll find a lot of airlines are not included in the online sites. For instance going to Vegas you only get quoted the big US airlines, yet just go to Chicago, and book your own flight onto to Vegas with SouthWest Airlines. Sometimes this can work out cheaper, however you're luggage is not checked through doing it this way, but if it saves £200 or so, it has to be worth it.