As a teenager she was spotted recording Stevie Wonder-influenced demos at The Kitchen in Norwich with her father (himself an experienced musician and local restaurateur) on piano. At the time she was working for Norwich Union. Simon Fuller signed her to his 19 Management company (with whom she is still signed) and to label Polydor at aged 17, and this began a career-long association with the impresario that has seen Dennis provide songs for many Fuller-related artists and projects.
In 2004, Dennis was listed 66th in the Q Magazine list of the top 100 most influential people in music and in 2006 she won the UK music industry's Woman of the Year Award. According to britishhitsongwriters.com she is the ninety-ninth most successful songwriter in UK singles chart history based on weeks that her compositions have spent on the chart.
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