Flight Heathrow Airport departs from London Heathrow Airport at 11:00 and arrives at Kuala Lumpur Kuala Lumpur International Airport at 07:15.
The flighttime is about 12h 15m. The distance travelled ("as the bird flies"): 10913 Km. So the average speed is roughly 891 Km.
There is an 8 hour time difference between London and Kuala Lumpur