In 2010, the advent of the Conservative-led coalition government following the (UK) general election influenced Petrie, who is a socialist, feminist, and lesbian,[2] towards an increasing emphasis on politically focused songwriting, from a left-wing perspective.

She made her debut appearance on Glastonbury's Leftfield stage at the invitation of Billy Bragg in summer 2010, and widely praised third album Tell Me A Story followed, including signature song "Farewell to Welfare".

A special film directed by Chris Shepherd for the song "Rise" from the same album was screened on Channel 4 as part of the TV series Random Acts.

In 2013, Petrie released her fifth album Love is My Rebellion with new backing band The Benefits Culture, consisting of Jess Greengrass (percussion) and Caitlin Field (bass).

She has toured nationally with Emmy the Great, Billy Bragg and comedian Robin Ince, and has made several appearances on BBC Radio 4's The Now Show.