Alexander Armstrong joins The Sixteen for Good King Wenceslas charity single

Classic FM presenter Alexander Armstrong and the voices of Classic FM, The Sixteen, have joined forces to release a single to raise money for homeless charity Crisis.

Armstrong, familiar to millions of viewers as the host of quiz show Pointless and as one half of comedy duo Armstrong and Miller, is a man of many talents, including singing.

The former Trinity College, Cambridge, choral scholar has now joined Harry Christophers and The Sixteen to record a very special version of Good King Wenceslas

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Armstrong said: "I rarely get to sing these days - and what a privilege to perform with this great choir for a wonderful cause."

Proceeds will go to Crisis, the national charity for single homeless people. "Crisis works tirelessly all year round," says director Christophers. "But it seems particularly poignant at this time of year."

Despite the involvement of many talented individuals, not everything went according to plan. Enjoy the outtakes below.