In 2004, Chambers worked with Beverley Knight, co-writing the songs "Affirmation" (also the title track of the album), "No-One Ever Loves in Vain", "Under the Same Sun" and the top ten single "Come As You Are". He reunited with Knight on the 2009 album "100%" and co-wrote the title track "Soul Survivor" that Knight duetted on with Chaka Khan. That same year he co-wrote "Shine" with Kara DioGuardi for Hilary Duff. He also co-wrote and co produced "Silent Movie" with Natasha Bedingfield for her album "Unwritten". In the same year, he co-produced American singer-songwriter Aslyn's debut album "Lemon Love", and co-wrote the song "Here", and co-wrote 7 songs on Brian McFadden's debut album — including the single "Real to Me", and the follow up singles "Irish Son" and "Demons".