Shetland star Ashley Jensen is set to lead the cast of the BBC's upcoming one-off sitcom, Rambling – and it sounds brilliant. The Scottish actress will share the screen with Mark Bonnar (Line of Duty, Guilt) in the "warm" and "witty" show, which follows a pair of unlikely travelling companions in rural Scotland. 

Ashley, famed for her roles in Extras, Ugly Betty, and more recently, the BBC's hit crime drama Shetland, returns to her comedy roots in Rambling, which promises to be "poignant, moving and funny."

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Written by Iain Connell (Burnistoun, The Scotts) and Sharon Young (The Scotts), the one-parter is set against the sweeping landscape of rural Scotland and centres on the mismatched pair Gerry and Cat.

"You'd never put Gerry and Cat together," reads the synopsis. "He's order, she's chaos. Gerry plans every step. Cat gets lost on the way to the car park. Gerry's on a mission to fulfil a promise to his recently deceased brother. Cat's flying solo having been thrown out a walking group that was supposed to be a fresh start for her."

It continues: "The more they walk and talk, they discover they're travelling on common ground. Rambling is a feel-good Scottish sitcom all about putting your best foot forward."

Ashley Jensen and Mark Bonnar star as Cat and Gerry. 

Ashley, 57, said she's "delighted" to return to BBC Comedy in this "smart, honest, poignant, moving and funny" show. "It's about loss, loneliness, and our need for connection," she said. "I started my career with the BBC Comedy unit a long time ago, so I am delighted to return and be part of Rambling and to be reunited with the talented Mark Bonnar along with a resilient and incredibly skilled crew with whom we will be braving the Scottish elements to bring this beautiful special to life."

Meanwhile, Mark Bonnar said he was "thrilled" to be involved in the project."I've never played someone quite like Gerry before and I can't wait to get cracking," he continued. "On top of that, to be reunited with the wonderful Ashley Jensen! Doesn’t get any better."

The BBC has yet to confirm a release date. Rambling will air on BBC iPlayer, BBC Scotland and BBC One.