Shocked fans crowded around the 68-year-old music legend as he played several songs on a black piano at St Pancras International on Friday morning.
Photographs and videos posted on Twitter showed John playing a piano in the middle of the station, surrounded by a crowd of delighted onlookers.
After a brief performance, the Rocket Man star thanked fans and signed the piano had been playing with "Enjoy this piano. It's a gift. Love, Elton John".
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Shocked fans crowded around the 68-year-old music legend as he played several songs on a black piano at St Pancras International on Friday morning.
Photographs and videos posted on Twitter showed John playing a piano in the middle of the station, surrounded by a crowd of delighted onlookers.
After a brief performance, the Rocket Man star thanked fans and signed the piano had been playing with "Enjoy this piano. It's a gift. Love, Elton John".