Born in Prestatyn in north Wales, Demick moved with his parents to Belfast, Northern Ireland, aged 5.
With Demick on rhythm guitar, harmonica and vocals, the band released several singles, including "Bad Little Woman", later recorded by The Shadows of Knight, and supported visiting American musicians such as John Lee Hooker.
[2][3] After the Wheels broke up in 1967, Demick and his bandmate, lead guitarist Herbie Armstrong, joined Screaming Lord Sutch's band, known at the time as the Beautiful Quality, for six months.
[4] The following year, the pair left and recorded as the James Brothers, releasing two unsuccessful singles on the Page One label in 1968.
Demick and Armstrong continued as a duo under their own names, toured with a band, and released several singles and two albums, Little Willy Ramble (MAM, 1971) and Lookin' Through (A&M, 1972), described by Allmusic reviewer Craig Harris as "impressive".