Himself - Narrator / ... (316 episodes, 2000-2014)
Davina McCall
Herself - Presenter (140 episodes, 2000-2008)
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Trivia
The theme tune used for all the series was recorded especially for the program by Paul Oakenfold and Andy Gray as "Element 4". It reached #4 in the UK Singles Chart.
The action from within the house is streamed live over the Internet for a one-off fee subscription that lasts until the end of a series. Since the second series Channel 4's sister station E4 has also carried live pictures and audio from the Big Brother house. However the stream had a delay of 15 minutes so that audio and/or pictures can be edited out to comply with TV regulations.
In Big Brother 7, for the first time the public was able to vote a house-mate back into the Big Brother house, and they were also eligible to win the prize money as well.