<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by ExMo:
Well, I made the 100 mile R/T trek to MIA today. I spent about an hour at the BA counter and came away with a 19 segment, nicely printed by Amadeus, BA ticket for the balance of my current RTW. I must say that I was very pleasantly surprised by the professional manner of the ticket counter agent. He did a great job in about 45 minutes while I waited. Alas, I still do not have a tax calculation (he did not redo it) but each ticket is labeled "ALL TAXES PAID." We'll see if this counts for anything, anywhere. 
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My main concern for the words "ALL TAXES PAID" will mean nothing to CX airport check-in staff. They will scrutinise the ticket with a very fine tooth comb and unless they see the words HK next to a number for the HK departure tax, they may very well ask you to fork over the amount and will ask you to get a refund from BA if you have indeed paid for the tax.