“We see them dealing with the insecurities, the ambiguities, the hopes and the fears that are part of all marriages, as the drama explores the risks and the gifts of a long-term intimate relationship. Sometimes funny, sometimes moving, always revealing.”

It’s a particularly naturalistic series, so the story charts the minutiae of Ian and Emma’s everyday lives, rather than a big inciting incident or event.

Actor Henry Lloyd-Hughes teased one particularly dramatic scene in a recent interview with RadioTimes.com, describing how disaster strikes when Emma is invited along to a two-day conference by her younger boss Jamie, who Ian is suspicious of.

“It’s the most unglamorous thing in the world and Jamie spends a lot of time pretending he is too cool for it and has no interest, but also that it is sexy and that he is a big deal there” Lloyd-Hughes said.

He added: “For Emma, it’s tied in with her ambitions and another level of her career hopes and that Jamie has chosen her and only her. In name and spirit it’s a promotion to be taken to the conference as his right hand person. Of course, from Ian’s point of view, this is a real crack in their long held and very real marriage.”

Lloyd-Hughes continued: “It is amazing to have a conference as the central set of a piece of drama, rather than a plane crash, car crash or big explosion. But only Stefan can do that and that’s why it’s brilliant. The conference is the showdown!”