Along with his younger brother, the foursome attended the Ludgrove School together and have remained good friends ever since.
Mr Straubenzee served as an usher at the Royal wedding in 2011 and shared a toast at the wedding reception.
He was also in attendance as an usher at Harry and Meghan’s wedding in May 2018.
It comes after recent reports that Prince Harry was visited by an old friend, Guy Pelly, in the USA.
