OK I'll be a little more helpful. Go to the search function on this site (at the bottom of the topics list) and enter Barclays.
You'll see this question has been asked before, several times, and has annoyed ABers most times.
One answer, somewhere, does give a hint at how you might set about answering this question.
Unfortunately we now live in a world where people think they can get along without doing any work themselves.
The answer however, is obvious. At your interview tell them the challenges are that they are a bunch of thieving shysters. The opportunity for the organisation is to continue to rip us off while paying pennies for call centre staff in Bombay