For having already worked for Standard Chartered, I can ensure to you that you have been invited to the interview just to show that they interviewed people... The position must have been already filled by a friend to the hiring manager. A guy arriving 20 mns late and telling you he has only 15 mns! This is typically Standard Charetered. This hiring manager must be an indian.
It is likely that I was invited to the interview so the entire process can be HR compliant. The position probably has already been filled by a friend to the hiring manager. Unfortunately, the hiring manager was a Caucasian.