If UK resident you pay:
-2 years HKG tax, 1 year in advance 1 time only
-1 year UK tax, UK tax man will deduct part paid in HKG.
Non resident:
- 2 years HKG tax, 1 year in advance 1 time
- rest in country of residence, could be nothing depending on tax treaties.
WARNING: this is NOW, in October 07 all is/could be changing