Gogglebox's Marcus Luther has reportedly signed up for a new Channel 4 show that will see celebs locked up in a prison simulation.

Called HMP, the new programme will see famous faces paired up with a reformed former prisoner and locked up for several weeks to see how they cope.

Lewis actor Laurence Fox and former MP Neil Parish were previously said to have signed up, and The Sun now says that they will be joined by Luther, who appeared on Gogglebox with his partner Mica until last year.

"This is not one for the faint-hearted," a source told the newspaper.

"Marcus will have to face everything real prisoners go through, from cramped living conditions in a cell to ultra-strict wardens who won't be giving any of them the star treatment - and that's without even mentioning the grim reality of prison food."

HMP is due to be filmed in the coming weeks and could air on Channel 4 as soon as later this year.