It is a scheduled flight, so may be BA, Cathay Pacific etc. There will more than likely be a short stop in Hong Kong or somewhere. It is worth ringing P&O if you have already booked to find out who your airline will be.
I see that you are on the world cruise abord the Arcadia January 2009, are you sure that this cruise goes to New Zealand as i am on this cruise and it is not on my list of ports of call.
What airline do p and o use when flying gatwick to barbados.