In 1981, the line-up changed, with only Willcox and Bogen remaining for the band's next set of releases. They were joined by Phil Spalding on bass, Nigel Glockler on drums and Adrian Lee on keyboards, and released the hit EP "Four from Toyah", the lead-track from which is a cover called "It's a Mystery" – originally recorded by Sheep Farming's producer Keith Hale and his band "Blood Donor". "When I first heard 'It's a Mystery' I thought it wasn't for me. It was written by a friend called Keith Hale for a band called Blood Donor and the record company wanted me to cover it…" Toyah remembered. She hated it, thinking it was the end of her career, "of four brilliant years' work as a credible rock artist... Because I'd worked from 1977 right up to 1980 and I had an army of followers and I just knew this song wasn't for them", she added. But the song proved to be a major success, and subsequent promotion pushed the EP to No. 4 in the UK singles charts.