The show's central roles are played by real-life siblings Daisy May Cooper and Charlie Cooper, who also created and wrote the series together.

Paul Cooper, the real father of Daisy May and Charlie Cooper, plays Kerry's estranged father Martin Mucklowe, marking his first ever acting role after having no previous experience before his screen test.

Paul Cooper reportedly based the voice and mannerisms of his character Martin Mucklowe on unsettling police interview tapes of serial killer Fred West, who had lived nearby in Gloucester.

Although credited under the pseudonym 'Ivy Woodcock', the never-seen voice of Kerry's mother Sue Mucklowe is actually provided by Daisy May Cooper herself.

The Cooper siblings first performed in character as the Mucklowes in 2016 on the BBC Three show Live from the BBC, before This Country was commissioned.

Although the material was based on things that happen in Cirencester, the BBC felt that town was too big for the show's tone, so filming instead took place in the smaller, more isolating town of Northleach in the Cotswolds.

Filming for the first series began in September 2016 and wrapped after just three weeks.

Actor Michael Sleggs, who played Slugs in the first two series, announced in May 2019 that he was suffering from heart issues; he died 40 days later at age 33, shortly before the third series began filming.

An American adaptation of the show was developed by Fox with Paul Feig directing and executive producing, initially retaining the title 'This Country' before being renamed 'Welcome to Flatch' in May 2021.