“But it is such a joy to have such a brilliant writer, so it doesn’t matter how difficult it is to do those huge long scenes in the offices that take forever!

“We all know each other so well now that if we mess up it doesn’t matter.

Her daughter Ella Jayne was born with Rubinstein-Taybi syndrome, which can result in short stature, learning difficulties, and can also include heart and kidney defects.

Her condition meant that she sadly passed away at only eight months old, leaving her parents totally devastated.

“I think the first time we were here people were excited, the second they were a bit peed off and now they’re just like ‘please get out!

’” “However she can see there is a slight threat there with Lucy (Freeman), therefore Anna’s inability to play it cool gets more and more prevalent as the series goes on.” :: W1A returns on September 18 at 10pm on BBC2.

Parish says: “Having a baby is supposed to be the happiest, best time of your life but for me it was the worst.

Murray says: “We are reaching out to corporate sponsors, and London because the hospital will cater for it.

You panic and will look for blame everywhere; you want someone to answer a question that can never be answered.” But having dealt with the same hospital, Parish says: “I know they are 100 per cent professional.

The parents are Jehovah’s Witnesses so they have a different set of rules.

If you take a child out of hospital without checking it out you have to contact the authorities. ’ are so overwhelming you are forced to live in the present. “There is nothing a doctor can tell you because there are so many uncertainties, and you have to get your head around that”. I can remember feeling quite ecstatic for parts of day and then incredibly low.” Ella-Jayne spent Christmas and New Year at home.

Anyone could have taken that child out.” Murray says they coped by taking each day “on a minute-by-minute basis. “We knew she wouldn’t last for ever but we didn’t know she was going to die.