Thanks to the very bright, astute, and otherwise wonderful Erie, I discovered Oasis Hong Kong (new window) today. Checking some dates to fly from Hong Kong to London, you can fly for $1′634 HKD (£110, $210 USD). I could book a flight either on Monday (27 Nov) or in June 2007 and still get the same price.
I’m sure it comes with all the usual provisos of budget airlines, they don’t feed you, they don’t entertain you, etc, etc, but whichever way you look at it, £110 to London is still an amazing deal. Thanks Erie… 
Hi. I looked into some dates and could only manage £450 for most of them! Think I need to look a little closer!
JC.
27th of November, London to Hong Kong £141.37 including taxes…