Originally created as a one-off tie-in series by Channel 4 in association with the BBC's Comic Relief charity telethon, Celebrity Big Brother is now a full spin-off of Big Brother UK, shown on Channel 4, S4C and Internet live streaming and downloading, backed up with email and SMS text news reports to subscribers. The series is usually broadcast in January. The series features a number of celebrity contestants living in the Big Brother House, trying to avoid eviction by the public with the aim of winning a large cash prize to be donated to the winner's nominated charity at the end of the run. The show uses the same house and presenters as the non-celebrity version of the most recent series, but the time length is shorter than a normal Big Brother UK series. The celebrities are normally paid for their appearances, on the proviso that they don't voluntarily leave. In 2011, the series moved networks to Channel 5 and Brian Dowling took over as presenter.