Gogglebox favourites Steph and Dom Parker are back on the small-screen in an investigative documentary about medical cannabis.

Swapping the sofa and TV reviewing for cold hard facts and exploration, a one-off Channel 4 show asks whether the drug could help improve the life or and perhaps save their son Max.

Max, 18, suffers 120 seizures a day and is “trapped at age six”, having first experienced infantile spasms at just four months old.

Now, the parents, Max and 15-year-old Honor are the subject of a though-provoking documentary.

What is Steph & Dom: Can Cannabis Save Our Son?

The hour-long informative documentary follows the Gogglebox couple as they parent disabled son Max, who has severe epilepsy. His condition causes upwards of 100 seizures a day and childhood seizures were so fierce that they caused severe and irreparable brain damage.

Through the course of the show, we learn that conventional drugs – with their painful side effects – have proved little respite with Steph and Dom seeking more knowledge about the use of medical cannabis.

While the cannabis and oil wouldn’t reverse any damage, it could help to save him and the parents are willing to try and explore every last avenue for their son.

Their daughter Honor and Max’s carer also feature in the documentary, which is as much about the strength and love of a family as anything else.

What have the family said about the documentary?

Speaking on Monday’s Good Morning Britain, Dom discussed the programme with anchors Piers Morgan and Susanna Reid.

He explained: “I'm not sure he's even aware that he's actually suffering. It started at four months and they got on top of that with steroids and it went away. And then at aged four it came back with a vengeance.

“He;’s just turned 18 at the end of the show and probably trapped in aged six and stuck there. He’s a beautiful, polite, charming young man but there is very little conversation. He doesn’t really talk very much. Communication is limited but you can see when he is suffering.

“But one thing we learned through the course of the show is that when he had seizures – up to 120 a day – he’s not feeling it and he’s not remembering it. Therefore, it’s evidently not as painful for him as it probably is for us to watch.”

When can I watch it?

Steph & Dom: Can Cannabis Save Our Son? is tonight at 9pm on Channel 4. It will be available to catch-up on All 4 after.