Kassidy began writing and recording their music in a share house, which they later converted to a personal studio.

To follow their EPs, Kassidy released their debut album, Hope St., on 21 March 2011.

On 1 February 2014, the founder and frontman of the band, Barrie-James O'Neill, left the band to move to Los Angeles to be with his then girlfriend, Lana Del Rey, and has since adopted the stage name "Nightmare Boy" as a solo artist.

The remaining members have since formed a new band called White, along with Leo Condie and Kirstin Lynn.

This was to coincide with the release of a vinyl edition of their first album and the promotion of a special event to be performed on 23 December 2021, to celebrate the 10th anniversary of their debut.