Lowest fare, which one?

People, help me out here!...could anyone give or guide me as to which airline offers the lowest fare to London from Kuala Lumpur? My budget is around RM2500 to RM 3300..I plan on going next coming January so I would like to compare several options that could at least cut bits of my cost..

Oh, multiple options are encouraged…if you have the link, the better..Thanks!!