While Lucky Day came to a kind of resolution, it also left viewers with a feeling of unease as Anita Dobson's enigmatic Mrs Flood freed Conrad from incarceration for reasons that are as-yet unclear – but will be explained soon.

"I can say that Jonah comes back – the battle is not won," teased Gibson on last night's episode of The One Show.

"He comes back and Russell [T Davies] has written an amazing script, as always. I come back as well and I'm reunited with the Doctor and Belinda, played by Varada Sethu."