[1] Thirsk was also involved in the initial stages of Adrian White's side project Silent Alarm.
The Sleepthief album The Dawnseeker, released June 2006, features Thirsk's vocals in the songs "Sublunar (Sweet Angel)".
Sleepthief's follow-up The Chauffeur – The Remix – EP features Thirsk on "Send Me an Angel", a remake of the Scorpions' 1990 power ballad.
In May 2008, Thirsk released a limited edition 4-song EP called Under Cover EP with the songs "Hourglass", "Conspiracy", "What If I", and a cover of Prince's "When Doves Cry" that features exclusive mixes of the four songs that will also be on her upcoming solo album.
Kristy also co-wrote and sang vocals "Black Flowers" from Matt Darey's Urban Astronauts project.