The poignant love story follows a husband and wife struggling to keep their relationship alive through the harsh reality of lockdown.

Directed by Stephen Daldry (The Crown), the film traces a British couple from the first days of the Covid-19 lockdown in March 2020 until the present day. Both hilarious and heart-breaking, the couple are forced to re-evaluate themselves and their relationship amid a global tragedy.

Horgan plays She, a charity coordinator for a European refugee charity. She is the daughter of a dentist father and an ‘old socialist’ mother, who is the only surviving grandparent.

McAvoy stars alongside Horgan as He, a self-employed, self-made man running his own boutique computing consultancy. Having been forced to furlough his staff, He has taken to growing vegetables.

Their ten-year-old son is Arthur or ‘Arty’, who has been solely responsible for keeping his distant parents together, until lockdown.

Writer Dennis Kelly said: “Together is about a couple who totally hate each other, but have somehow found a way of existing together by not talking to, thinking about, noticing, communicating with or being in the same room as each other - then lockdown happens.

“It’s about how humans negotiate their shared experiences when they think they have nothing in common other than staying alive, and it's about how you can hate what you love and love what you hate. And Sharon Horgan and James McAvoy are brilliant in it.”

James McAvoy added: “It’s a hilarious, heartfelt, entertaining and unconsciously funny exploration of a relationship and a couple facing real tragedy across a year we have all lived through. ”

Sharon Horgan commented: “I think everyone who got involved in this film had no intention of doing a Covid drama but then we read Dennis’ script and changed our minds. We shot this in ten days so it was a beautifully stressful experience.

“Working with Dennis again - and Stephen Daldry and James McAvoy both of whom I’ve admired for years was a joy. But it also felt like we were making something important.”

Together is a Shoebox Films and Sonia Friedman Productions film for BBC Two and BBC Film.