Gavin’s family home is a house that is really in Dinas Powys while The Colcot Arms is a pub on Barry Island. James Corden based Smithy on his cousin’s friend, a man named Lee Andrews.

“I remember James saying he thinks if Smithy and Sonia didn’t have any other family, it was just them, they’d probably be fine,” said Robert Wilfort, who plays Jason in the award-winning comed ...