Expanding the roster might be just the balm a host of troubled couples need. Plus: Alan Carr oversees a Twickenham stadium makeover. Here’s what to watch this evening

10pm, Channel 4The eye-popping reality show, in which couples attempt to open their relationships, returns for a third romp. Mark and Tanith wonder if having sex with other people can help build trust – especially after one of them cheated. Then there are childhood sweethearts Chloe and Paul, who have never had sex with anyone else … Hollie Richardson

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