⟩ Explain what you will bring to the fast stream should you be successful?
A straightforward question asking you to outline your strengths and qualities. At least that is the way you should look at it. You should ideally consider the key requirements made of fast stream applicants from the information the selection board provided you with and reflect this back to the board.
You should certainly consider mentioning some or all of the following:
Desire/ambition to succeed
Interests in taking a lead role
Willingness to work flexibly and as required
A profound interest in researching and preparing policy documents
An interest in and aptitude for team work
Ability to take decisions
Ability to priorities activities etc,