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E4 has apologised after it repeated Wednesday's episode of Married at First Sight on Thursday instead of showing the series finale.

The channel blamed it on "ongoing tech issues" after technical problems at a broadcast centre resulted in several channels going off air on Saturday.

Channel 4 said its services were also having sound and subtitle problems.

the last episode of Married at First Sight would be broadcast on Friday at 21:00 BST.

The reality show "scientifically" matches couples moments before they marry. Over the following weeks of the show they decide whether to continue their relationships.

on Thursday, E4 said: "We're aware it's yesterday's episode of #MAFSUK playing out this evening and apologise. It's all down to our ongoing tech issues which we're working hard on."

Channel 4, Channel 5, the ����ý, Paramount Network and 4 Music were among those who were affected by the technical issues last weekend.

'Sonic wave'

Red Bee Media, which handles playout services and broadcasting technology for a number of channels, blamed an "activation of the fire suppression systems" at its broadcast centre in west London.

later suggested the issue arose when smoke was detected and the fire suppression system sucked all the oxygen out of the room. That caused a "sonic wave" that shut down the transmission servers, the newspaper reported.

Channel 4 said: "We continue to experience disruption to our services due to technical issues. We're working hard to resume our normal services and appreciate your continued understanding."