Philippine Airlines are offering return flights to London for $1189.60. Fares include bags, meals and seats. 1 stop in Manila both ways. China Southern are also offering the route slightly cheap but requires 2 stops on the way back and have limited dates. Maybe/maybe not worth it. Dates are February to March and May to June 2019. May/June is a great time to go.
This is the cheapest flight to London since March 2017