from the "daily telegraph":-
"Fans have speculated that the unusual location, 7,000 miles from home, is because British health and safety box tickers would have banned most of the rounds.
Sadly, the reason for the Argentinian location is more prosaic. Endemol has sold the programme to 36 countries, all of which film on this set, invariably bathed in glorious sunshine. It is cheaper to fly contestants around the world than to build 36 separate sets, crewed by 36 sets of technicians and cameramen. So when the British contestants have finished filming, waiting behind them are Turks ready to do battle."