The Shillelagh Sisters were a British female group composed of Jacquie O'Sullivan (vocals), Lynder Halpin (double bass), Patricia "Trisha" O'Flynn (saxophone) and Maria "Mitzi" Ryan (drums).

"Tensions arose when recording the first single, "Give Me My Freedom", a cover of little-known female soul group The Glories, who released their version in 1967.

[2] CBS felt the final result was not commercial enough and so it was re-done with a different producer, losing, Halpin later commented,[citation needed] the band's original sound in the process.

In addition, CBS refused to allow Boz Boorer to be a full band member, not letting him appear on the single cover or in interviews or video clips.

The group had some press coverage and also did some television shows (most notably The Tube) and a John Peel session at BBC Radio One.

[3] Soon after, CBS released their second single, the Latin-flavoured "Passion Fruit", with a cover of Nancy Sinatra's "These Boots Are Made for Walkin'" as the B-side.

It was composed of O'Sullivan, Halpin, Boorer, Phil Bloomberg, Neil Rooney, John Buck, Hilary C. Book, and Shirley.

A third album from O'Sullivan, tentatively titled The Jacquie O Collection, featuring new songs and re-recordings of her hits with Bananarama, was announced but the label folded and nothing was released.