BBC1 is developing a comedy drama about two young people with Down's syndrome who run away to get married at Gretna Green.

The 60-minute Honky Tonk is being developed in-house and the cast is yet to be confirmed.

Criminal Justice producer Hilary Salmon and Demons director Tom Harper are understood to be involved in the project, which is written by Jack Thorne (Skins, The Scouting Book for Boys).

Honky Tonk's plot follows Henry and Michelle, two 20-somethings who are in love and spend their days at a centre for disabled adults.

Henry is assured while at the centre, but overwhelmed by shyness in other situations and self-conscious about how his voice sounds to strangers, hence the title. Michelle is largely kept away from the outside world by her parents, so she and Henry decide to head to Scotland to marry.

A BBC spokesman confirmed that the drama was in development but said that it was “too early” to confirm other details.