I also wonder, VHG, about a user with similar questions and 'Asian English' (e.g. phrases such as 'reply me').
So I'll limit my reply to suggesting that using ANY travel website is usually madness. Booking direct with airlines can save a lot of money. The only direct flights from the UK to Beijing are with BA and Air China. However the best deals might be with some of these airlines:
Air Asia (connecting at Kuala Lumpur)
KLM (connecting at Amsterdam)
LOT Polish Airlines (connecting at Warsaw)
Malaysia Airlines (connecting at Kuala Lumpur)
Singapore Airlines (connecting at Singapore)