A London-based choir topped the UK’s music charts, beating out Justin Bieber.

The group is made up of National Health Service staff, including nurses, doctors, and midwives.

The singers said they couldn’t be happier about the positive response.

"We are just so excited,” Occupational therapist Bethany Henning said. “We, we can’t believe it. Thank you so much everybody for getting behind us and supporting us, it is just incredible."

The choir’s Christmas single is a mash-up of Simon and Garfunkel and Coldplay.

All proceeds from the song will be donated to several charities.

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