[4] Before his election to Parliament, Frith was the CEO and Founder of All Together, a social enterprise providing careers education and guidance services to young people to help them get into work.

[5] In the 2010 Bury Metropolitan Borough Council Election, Frith unsuccessfully stood as the Labour Party candidate for Elton ward against incumbent Conservative Michael Hankey.

[7] He successfully stood for Elton ward again in 2011, gaining the open seat from the Conservatives after disgraced incumbent Denise Bigg chose not to seek re-election.

[16] He edited a book entitled New Brooms, published by the Fabian Society in 2018, featuring a collection of essays on parliamentary reform written by several Labour MPs from the 2017 intake.

In an opinion piece for LabourList during the 2020 Labour Leadership Election, Frith invited all the candidates to visit his marginal constituency to better understand the seats they need to win.

Also in the piece, he was critical of the party's 2019 General Election campaign for 'sending hundreds of activists to Tory seats that we had no hope of winning' and cautioned against creating a 'manifesto that nobody believes'.