The 46-year-old actress has been married to Michael for just over 15 years and, following a brief split in 2013, the pair are happier than ever. Opening up about their relationship, Catherine admits it's in fact her who wears the trousers in their romance - particularly on the golf course.

"I’m pretty good, better than him and we have a bet that if he ducks a shot he has to drop his pants," Catherine laughed on an episode of The Graham Norton Show, which will be aired on Friday night (29Jan16).

"It’s not just my husband, it’s any man I play. There has been an issue with paparazzi so I make him go into the bushes. A deal is a deal."

Catherine was born in Swansea, Wales, but due to spending a lot of her life Stateside, only a lilt of her former accent remains. However, when she started dating Michael in 1999, her Welsh way of speaking caused a few issues between them.

"It always gets stronger when I’m talking to my family," Catherine said of her accent.

"When I first met Michael I was talking to my mum on the phone and when I finished, he said, 'That Welsh language is just beautiful,' and I said, 'What are you talking about? I was talking in English!' "

The brunette beauty can soon be seen in the big screen adaptation of BBC sitcom Dad's Army. The reaction to news a movie of the show was being made was mixed to say the least, but Catherine said it was the cast - which includes Toby Jones, Bill Nighy and Michael Gambon - that convinced her she needed to be involved in the project.

"When I saw the plethora of fantastic actors I wanted to be part of it," she explained.

"It’s so nostalgic for me. It was part of my childhood – my whole family would watch it and my dad can quote big scenes verbatim. The shooting of it reminded me of The Darling Buds of May. It was everything I hoped it was going to be."