Budget Travel - Is there a best time to book a flight in advance to Hong Kong?

I'll like some of your friendly advise please.

Is there a best time to book a return flight in advance from Manchester to Hong Kong?

I'm looking at flight prices from Manchester to Hong Kong now (to fly in March 2008) and KLM's price of £650, seems to be roughly £200 more than what I paid earlier this year, when I flew back in March with KLM.

Please can you advise me as I'm not sure if these prices will be the same price in the next few months... Or should I book now.

How many months in advance should I really book, for me to get cheap flight prices for March 2008?

Many thanks in advance to all replies!

eeeeerrrrrrrr well let me see, airline logic says please book as late as possible so we can screw you big style, consumer logic therefore should be reverse - I think. Use AVG to see best dates for lowest price seat availability and what is the Ryanair of long haul flying. Also check out the deals on Air New Zealand between UK and HKG, I often use BA for very cheap flights down to LHR and LGW from MAN

By the way its now June 08 and you want to fly in March 08 ?????

Cathay Pacific
04 Mar CX250 (LHR-HKG)

25 Mar CX255 (HKG-LHR)
£553.20
HK$8,530.0

I used skyscanner.net for this