British pop star Ed Sheeran has thrown his support behind a teenager's charity single.

The Lego House hitmaker met 14-year-old Rachel Ward, from Kent, England, at a London gig and she told him about Soldier, Soldier, her school's musical charity initiative which commemorates the lives lost in World War One.

Sheeran posted a link to the single on his website and urged fans to purchase the track to help Ward raise money for an array of British military charities.

Ward says, "While it was amazing to meet Ed Sheeran and record Soldier, Soldier, it's important to remember those who gave their lives and their families left without a husband, father or son."