MARRIED At First Sight recently returned to Channel 4 a third series – and we've got all the details you need.

The show features six singletons who put their faith in scientific matchmaking... but what else do we know? Let's get the lowdown...

2 Married at First Sight is shown on Channel 4 Credit: Channel 4

When is Married At First Sight on tonight?

The show airs its fourth and final episode tonight (Thursday, March 8).

It will be on Channel 4 at 9pm. Each episode this series lasts 60 minutes.

2 The programme features six people who agree to participate in an extreme experiment Credit: Channel 4

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What is Married At First Sight about?

As the name suggests, Married At First Sight sees two complete strangers meet for the first time on their wedding day.

Experts select compatible couples from a list of applicants, then invite them to marry on their first meeting.

A hair-strand test, which measures cortisol levels, or stress – an indicator of how people react to difficult situations - hormone tests and interviews about personality, likes and dislikes, are used to decide who will work well as a team.

Thousands of people applied to take part in the new season, and it takes a year of form-filling and tests for contestants to go from applying to exchanging rings.

The singles are also faced with having to persuade their friends and family that marrying a stranger is not a completely ludicrous idea.

The show's producers have increased the psychological support for this series, hoping that the three new marriages actually last.

The couples now spend eight weeks - instead of five - supported in shared accommodation after their marriage.