The two have been familiar faces on our screens for decades – with Speirs, 61, appearing in Star Wars: The Phantom Menace, Pirates of the Caribbean, and TV shows including Mrs Brown’s Boys, Inside No.9, Death Valley and Benidorm.
Jones recently portrayed Mrs Bennet in another comedy series, The Other Bennet Sister, which was inspired by Jane Austen’s Pride and Prejudice.
The programme included some scenes filmed in Wales which prompted Jones to give the cast a tour of Barry Island.
Their latest, as yet untitled, comedy has been commissioned by BBC Wales and BBC Comedy.
It is described as a “tender comedy” centred on an “unlikely friendship” and the “challenges and rewards” of relationships for people in their 50s and 60s.
“We were genuinely weak at the knees when this script first landed in our inboxes,” said BBC Director of Comedy Jon Petrie.
“It’s a rare thing to read something that feels so instantly special, and we cannot wait to see it come to life.”