If you check this page http://www.britishairways.com/travel...e/public/en_gb it details fuel charges.

According to the table (for point of sale as Rest of World):
$392 = 2 x $157 (i.e. 2 x longhaul under 9 hours) plus 2 x $39 (i.e. 2 x inter-europe flights)

Hence the fuel surchages ex HKG appear to be correct.