Prince Harry dropped by St John’s Wood on Friday to help Jon Bon Jovi record a charity single for the Duke’s Invictus Games Foundation.

With just weeks left as an active member of the royal family, he met the aging rocker on the steps of the world famous studio.

The prince and the popstar were then ushered inside to the control room overlooking Studio 2 - where The Beatles recorded during the 1960s.

Engineer Obie O'Brien, Jon's long-term friend and producer, was waiting to talk the prince through the process of re-recording the Bon Jovi's single Unbroken with the Invictus Games Choir.

The single is in aid of the Invictus Games Foundation which oversees the development of the Invictus Games, the international sporting event Harry founded for injured or sick military personnel.

Unbroken was created by Jon Bon Jovi to shine a spotlight on veterans living with post traumatic stress disorder (PTSD) and honour their service.