"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."
More top news
Cast your mind back to your last job interview. What was the one question that really made you sweat?
An ITV Tonight investigation found more than half of women surveyed between the ages of 18 and 34 have been sexually harassed in public.
Storm Doris is expected to move on quickly, with the worst of the weather gone by Thursday evening.