The National Health Singers, a vocal group featuring staff from the U.K.'s National Health Service (NHS), have released a track, titled Yours, in a bid to top the chart on 25 December (15).

The song is designed to boost support for the NHS amid fears planned government reforms will ultimately lead to a dismantling of the service, and the project has received a major boost from Welsh actor Michael Sheen, who provides a spoken message at the start of the track's promo film.

He tells listeners how junior doctors within the NHS undertake important tasks such as helping to deliver babies and run emergency units, and says, "Their ability to do all this is being threatened by reforms being imposed across the NHS. The NHS is in danger and we all need it to survive. The people you're about to see are the National Health Singers. This is a national choir founded by junior doctors. These NHS workers are singing for the NHS and its very survival. The NHS is truly special. Please help the National Health Singers to keep it yours."

The song had reached number 65 on the iTunes chart by Monday (14Dec15) and organisers hope it will rise in the run-up to Christmas and top the festive rundown, which in recent years has been dominated by winners of The X Factor. The talent show's 2015 U.K. winner, Louisa Johnson, was crowned on Sunday night (13Dec15).