In 2009 Sweet won The Edinburgh Comedy Award for best newcomer for his show 'Mostly About Arthur'. He also starred in Tom Basden's debut play "Party" alongside Basden himself, 2009 Edinburgh Comedy Award winner Tim Key, Anna Crilly, Katy Wix and Nick Mohammed. The play won a Fringe First before travelling to the Sydney Arts Festival and appearing in London's West End and in adaptation as a BBC Radio 4 sitcom.