Producer James Goss said: “If you hate the office, you’ll love Torchwood One. What if the people saving the world worked in an office every bit as dysfunctional, bureaucratic and infuriating as the one you work in? And yet, somehow, they manage it anyway?

“Torchwood One knows how awful work is, how terrible your colleagues are, how no-one ever seems to get anything done. But, despite the meetings, the stationery orders and the alien death machines, someone’s got to save the human race.

“Which is why Yvonne Hartman exists. Helped by her PA Ianto and hindered by her head of research Tommy, she’s the last person standing between the planet Earth and total annihilation. She’s amazing, and she’s terrifying.

“You don’t need to know anything about Torchwood One or even Torchwood. These are people you’ll recognise from your workplace. Their problems are just a bit weirder than yours.”

Actor Tracy-Ann Oberman added: “I love Yvonne. I don’t think of her as a villain. I’ve always maintained, having lived with this character and Big Finish now, as the world goes from trauma to more trauma, that Yvonne should be running the whole thing – firm but fair, a benevolent tyrant, with a moral code.”

Gareth David-Lloyd explained Ianto’s role in the box set: “He is trying to keep everything together, like he always does. Dinner for Yvonne is probably the most terrifying mission he’s been on – interrupting Yvonne on her day off is one of the scariest things he’s ever had to do! He’s also got a lot going on – this one’s a tough one for Ianto. He goes through quite a disarmament.”

Tim Bentinck, Tracy-Ann Oberman and Gareth David-Lloyd

Ed White and Anniwaa Buachie

Lesley Ewen and Ian Abeysekera

Timothy Bentinck, Gareth David-Lloyd, Lu Corfield and James G Nunn