"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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One officer ended up with a dislocated shoulder and the other a broken eye socket.
The pair were stranded around 200 metres from the shore and helped back into open water using an inflatable raft.
While recycling varies from borough to borough in London here's what generally belongs in each bin.