None of the episodes of Secrets made the UK Top 70 most-watched programmes chart. The exact viewing figures for the majority of the series are currently unavailable, except for Episode #1.0 (1994) and Episode #1.1 (1995), which have their viewing figures listed under their respective "Trivia" sections.
The concept of Secrets being a nightclub is just a pretence for the series, and the "nightclub" is, in fact, a BBC studio.