expired Singapore to London Return $430 (or $149 One Way to London) Via Norwegian Shuttle (Oct 17 - Jan 18)
Norwegian Air Shuttle is offering direct flights to London Gatwick for $149 one way and $430 return. The outbound from Singapore is $149 and the inbound is $281.
Flights are via the 787 Dreamliner. The bad side is that these fares don't include bags, seat selection & food. Bags are $45 each way. If you want bags, food and seat section you are better selecting the LowFare+ option which adds about $90 on to the fare each way. Still a good price.
This beats the previous cheap price to London of $199 one way and $520 return.