Watch moment British Airways crew flash mob surprises passengers with Christmas carols

A flash mob of British Airways staff surprised a terminal of passengers with a Christmas song.

The choir, made up of 15 employees provided an impromptu festive performance by caroling through London's Heathrow Airport to the delight of unsuspecting travellers.

The act begins in the Terminal 5 baggage hall, as passengers disembarking flights await their luggage.

In flash-mob style, a member of the cabin crew kicks off the musical performance - a version of the classic Christmas song Deck the Halls - as she collects bags from the carousel.

A number of other staff members - turned soloists - join in, including one member of cabin crew who had just landed at the airport, fresh from a shift on a flight.

Other employees then emerge from various parts of the terminal, taking the song from the baggage claim area and into the arrivals hall where the rest of the British Airways choir is waiting, as passers-by are reunited with their loved ones.

Footage of the musical display was posted to YouTube on Monday, and captures the full performance, and the reaction from the astonished onlookers.

People can be seen pulling out their phones and capturing the surprise show - which turns out to have been conducted by a West End musical director.

Richard Beadle, who is currently working on the hit stage show Hamilton, trained the choir with weeks of rehearsals ahead of the performance.

In a statement, Mr Beadle said: "I was amazed by the dedication and talent from the British Airways choir, they really put their all into creating an amazing performance for their customers.

"Working in West End theatre, we are used to training sessions, followed by dress rehearsals, followed by live performances; it's a very tiring process.

"Some of the British Airways choir swapped their day-jobs of flying a plane or servicing an aircraft, to performing in this choir, all without breaking a sweat."