I'm not a fan of the modern 'swearing for laughs' thing that comedians and others seem to adopt just to get a laugh, but, this was Bradly being a normal everyday bloke flying high, knackered, but still pumped.
A guy proud of his own achievement as a cyclist. A guy so obviously proud of his country at that moment in time, who 'slipped' out a swear word, which in actual fact, was part of a quote from a soldier, who he totally admires for his chosen path in life!
I don't think he would make a habit of using unacceptable language ordinarily and think at this moment in time should be cut some slack!