The series is a spin-off of The A Word, the family drama which follows the Hughes family as their son, five-year-old Joe, is diagnosed with autism.

The A Word’s creator, Peter Bowker, will write the six-part series alongside a team of new and emerging disabled writers.

Ralph And Katie will follow the young couple as they embark on their first year of married life, and the challenges and triumphs that come with it.

Each half-hour episode will shine a light on a different domestic test faced by the newlyweds and how this is affected by the fact that they have Down’s Syndrome.

Bowker commented: “Ralph And Katie is a natural step forwards from the ongoing ambition of The A Word to increase representation and diversity both on and off screen.

“Equally exciting is the opportunity to work again with two young actors as talented as Leon and Sarah. It is a tribute to their performances in The A Word that the BBC have commissioned this series.”

Expressing her anticipation for the new series, Sarah Gordy said: “It is great to be able to take the character of Katie forward after her exciting journey in series three of The A Word.

“The wedding and the dress was a dream come true for Katie. I am so looking forward to seeing what comes next in Ralph and Katie’s married life.”