"Kate asked what kind of music I'd been playing," Corporal Steve Johnson, an RAF recruitment officer from Newcastle, who is busking at Tube stations across London told the Press Association. "She asked me to play but then said don't because it's too busy.
"Kate was more interested in the music, while William was more concerned with the day itself and how the appeal was going. Lots of people are ecstatic to see them."
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A boulevard in the Olympic Park has been named in honour of the former Culture Secretary Baroness Jowell who died last year.
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Details of Archie's birth have so far been shrouded in secrecy but certificate reveals he was born at 5.26am on May 6, weighing 7lb 3oz.