She formed the group Bananarama with Keren Woodward, her childhood friend, and Siobhan Fahey, whom she met at college. In 1980, Dallin and Woodward met Paul Cook, ex-member of the Sex Pistols, in a club and they became fast friends. They sang backing vocals for his and Steve Jones' new band The Professionals, and had their first taste of the music business, recording demos in famous Denmark Street.