Katie is a regular guest with folk band Broom Bezzums. She added vocal harmonies on two tracks on their 2011 album, Wine From a Mug (the title track and Empire Windrush). After two German tours with the band she was asked to contribute more vocal performances for the 2012 album, Winterman. On the 2015/16 release, No Smaller Than the World, Katie contributed the song from which the album title was taken, Passing Through, also taking on lead vocals. Her singing features on eight further songs on this album.