The four-part drama explores the heartbreak and pain of a family being torn apart from having to make a choice no parent would ever want to make.

Sharon Horgan and Michael Sheen play married couple Nicci and Andrew and together they have two daughters Katie (Alison Oliver) and Marnie (Niamh Moriarty).

However, Marnie is terminally ill with a life-threatening condition and the doctors believe the kindest thing to do would be to let her die.

However, her family are fiercely against it and don’t believe it would be in her best interests, so are prepared to fight for her right to live. 

The fight takes them through a stressful legal battle and they struggle to determine who has the right to decide in making this monumental decision. 

The rest of the cast includes Noma Dumezweni (The Undoing) as Samantha, Chizzy Akudolu (Holby City) as Mercy, Des McAleer (Hope Street) as Eddie, Mat Fraser (His Dark Materials) as Greg, Gary Beadle (Grantchester) as Frank. 

Jack Morris (Strike) plays Tom, Pippa Haywood (Bodyguard) plays Judge Spottiswood, Shane Zaza (Happy Valley) plays Fred, Lucian Msamati (Gangs Of London) plays Derek and Lisa McGrillis (Mum) as Brenda.

Sharon Horgan commented: “Best Interests broke me when I first read the script and then again after talking with Jack about it. Covid seems to have shone a closer light on the desperate inequalities that exist for our disabled community so this felt very timely. It’s a big subject but it’s in Jack Thorne and Michael Keillor’s safe hands.”

Michael Sheen added: “Jack Thorne is such an extraordinary writer and he has approached this incredibly important and urgent subject with humanity, honesty and humour.”

Filming for Best Interests is currently taking place in London and is set to air on BBC One and BBC iPlayer next year.