They released several singles in the mid 1970s, but did not achieve success until radio stations began playing the B-side to their single, "Bye Love". The song, "I'm On Fire", was then released in its own right and became a major hit throughout Europe, peaking at number 4 on the UK Singles Chart; and at number 1 on the German Top100 Singles chart and the Swedish chart. It also charted in the United States where it reached number 26. Though Charles provided the vocals, she was not at the time publicly acknowledged as the group's singer, and on the band's 1974 appearance on BBC Television's Top Of The Pops, singer/actress Luan Peters fronted the group.
In 1975 the group was expanded by producer Tony Eyers into a permanent five piece with the inclusion of Martin Cohen (bass and vocals), Kevin Wells (drums) and Mike Nelson (keyboards).
Subsequent group singles failed to attract widespread interest, although the group became popular in Germany. On the eve of a German tour, Charles left the group after a dispute with their record label, continuing on with her successful solo career. She was replaced by Linda Kelly. The next single "Doctor Kiss Kiss" reached number 8 in the UK, but the band struggled to maintain public interest. A handful of further UK singles and a self-titled album followed, as the band tried to come back with "Light the Flame of Love", "Take Me Back" and "(Walkin' On) A Love Cloud" throughout 1976. None of those songs registered with the commercial mainstream at all. One further single, "Can't Stop Myself from Loving You", appeared the following year before the band, never fully recovered from Charles' acrimonious departure, disbanded for good.
Jay launched a solo career without success, and eventually returned to his earlier role as a session musician, working for such bands as Enigma and Tight Fit in 1981, and the UK Mixmasters in 1990.
Interestingly there is now a DJ in Hertfordshire and North London called Dr Kiss Kiss, who takes his name from the hit song.
source - wikipedia.org