Married at First Sight UK viewers are in for another explosive episode tonight as new couples tie the knot and cracks continue to show.

Since its return on September 21, viewers have already witnessed four couples say I do to a complete stranger - but not everyone is thrilled by their pairing.

These include Aberdeen-born Sarah, 31, who matched with hopeless romantic Dean, also 31, from Feltham. And despite Dean being pleased with the decision, Sarah found there wasn't an "instant spark", OK reports .

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In tonight's (September 23) episode, Sarah and Dean continue to navigate their newly found relationship, as Sarah's doubts continue to grow over her partnership with Dean. On their

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