Voiceover: Caius Juliyan (2012)
TalkbackThames for Channel 4, 24 May to 12 July 2011 (8 episodes in 1 series)
Boundless for Channel 4, 21 March 2012 to present
Members of the public bring along their collectibles to sell to one of four buyers. However, they can only hear each buyer's offer one at a time, and they cannot go back to an offer once they have rejected it, meaning they must decide whether to stick with the offer they have received, or move onto the buyer in the next room in the hope their offer might be better.
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The show publicised the hashtag #fourrooms.