First of all, I wish you luck!
The truth of the matter is that the UK airline style culture in CX does not like the "woo-hoo" American w*nker type of personality . OK, I know this may not be popular but it's true! There are no ...."american, americans" in the CX pax fleet , those that are there are worldy and quietly spoken. One American guy got sacked recently for his ...personality/attitude ....I think. I have also been told by someone who does the interviews that the technical and "world" knowledge of US pilots is often disapointing.
There are plently of Yanks in the freighter fleet, but that is a different story.
(Also! As they say in the classics ..."don't mention the war!".)