The duke, who was joined onstage by Sir Keith Mills, the former Invictus Games Foundation chairman, said whenever he was asked how long Invictus will last, his reply was "as long as it's serving a purpose".He added: "The root cause of the problem is conflict and I can't fix that.

The duke, who was joined onstage by Sir Keith Mills, the former Invictus Games Foundation chairman, said whenever he was asked how long Invictus will last, his reply was "as long as it's serving a purpose".He added: "The root cause of the problem is conflict and I can't fix that.