QM2 is owned by Carnival UK, which in turn is owned by the Carnival Corporation of the USA, as is P&O Cruises. The vast majority of cruise lines use foreign nationals in the lower ranks. Some of the P&O indian, Philippino and Pakistani crew members have generational links stretching back to when the company was first founded. It is not true to say that QM2 have no British ratings, there are many in the bars, entertainment and catering areas that are British. Captain Warner is now Commodore Warner and he is in command of QM2 on this cruise.
I think the most important thing is that RMS Queen Mary 2 is the flagship, not just of the Cunard fleet, but of the entire British merchant navy and proudly flies the Union Jack on her stern wherever she goes and is regarded as a true icon of Britain, succeeding the magnificent Queen Elizabeth II as the most famous ocean liner in the world. Plus, she's drop dead gorgeous inside and out.
Simon