Flights to London
I had a look at Oasis at OASISHONGKONG.COM and they do offer flights down to 1000HK one way. If you play around with dates and tax you normally end up around 4000-5000HK return which is still a very good deal and it is possible to get lower if you were flexible about when you travel.You would obviously have to find a cheap flight to Hong Kong to tie up with it and that might take some effort, but if you have plenty of time to spend on the net I'm sure you could do it.