I really understand how the argentinian people feels about this, they still feel the Fawklands or "Malvinas" (how they call it) are argentinian, when you enter to argentina in every border pass there's a big sign wich says "Las Malvinas son argentinas" and they always says they will be back.
In Argentina there is a deep anti-england feel, still 32 years after. In fact they blame Chile for help UK with intel information during the conflict.
Probably the number plate is the original and wasn't bad intention in that but I think BBC people are clever enough to see the problem before going there, specially to the southern part of the country. I really dont believe they wasn't notice.
I'm chilean with england and german roots and I'm married with an argentinian living in Chile, now I will have to hide to watch TG...
PS: People from US: what you think about a "911haha" number plate? how you feel about that? throwing rocks will be the least you will do, probably invade some other country or so