If you book through the Hong Kong Zuji website for dates in May, spending a couple of days in Moscow on the way out, you can get flights to Hong Kong for £330. If you don't spend a few days in Moscow on the way out, then you will get hit with higher APD and the price goes up to £370. You need to choose London Heathrow as the departing website or the fare may not come up. Airline is not too great (e.g. no inflight entertainment), but the fare is good and the extra stopover is worthwhile for many.