Bayan da Crisp ya rushe a 1997, Sia ya koma London, inda ta yi aiki a matsayin mawaki na baya ga Jamiroquai na Birtaniya. Ta kuma ba da jagorancin murya ga ƙungiyar Zero 7 ta Ingila a kan kundi na farko na uku da kuma yawon shakatawa tare da rukuni. A kan Zero 7 ta 2001 album Simple Things, Sia ya ba da gudummawar murya ga waƙoƙi biyu: "Destiny" da kuma "Distractions". "Destiny" guda ɗaya ya kai No. 30 a kan UK Singles Chart. A shekara ta 2004, ta ba da murya ga Zero 7 a kan "Somersault" da "Speed Dial No. 2" (daga kundi Lokacin da Ya Fada). A shekara ta 2006, Sia ya sake yin aiki tare da Zero 7 don kundi na uku na ƙungiyar, The Garden Garden, kuma daga nan sai aka dauke shi a matsayin "ba a hukuma" ba.
wani cakuda kayan kida da kayan lantarki don tallafawa kayan aikinta