Having just watch the TV series back-to-back, this was a bit of a disappointment.
The relationships which formed much of the humour was not there, not even the wise cracks of DI Wise.
In reality, the police wouldn't have allowed a foreign civilian to have such s role in the search for the murderer.
The views of Hong Kong were nice and probably helped the tourist board (I have flown Cathay Pacific myself so gave seen the lovely scenery on landing) as well as British TV having one last hurrah before handing ownership back to China.
The culture, intensity and Catholicism of the TV series was missing and being written by and for Brits, Hong Kong culture wasn't really looked into.
There really was no need to film there and, as with other TV specials, money was thrown at this but rarely pulls it off.
A good watch but lacks depth.