Doctor Foster has a fantastical, sexy edge

Gemma Foster comes face to face with her cheating ex-husband Simon (Bertie Carvel ) and, below, talking to their son Tom (Tom Taylor) you don’t speak about. Hopefully men and women will recognise some of themselves in our story.”

In one of the many tense conversations between Gemma and Simon during episode one, he tells her she hasn’t moved on and that she even wears the same clothes.

“It was really interesting when we were thinking about the look for Gemma, we knew it was two years later so we gave her a new look,” notes Suranne who has also starred in Coronation Street, Scott And Bailey and A Touch Of Cloth.

“I was so convinced, I said ‘You would, you’d change, you’d move on, you’d attempt to be different’ and then when we saw it in the screen test, every single one of us went ‘No, she’s moved on but actually she’s comfortable with her bob and her work’.

“She’s put up her walls and she would’ve been confident and comfortable in that life living with her son and getting him to 18 and moving out, but he (Simon) moved back. So actually, it was the right decision to move her on but leave her embalmed in a way.”

We also see Gemma reluctantly accept a date, which ends in unexpected fashion.

“The thing that interested me is that when people talk about someone moving on, especially with a woman, it invariably means finding someone else,” comments Mike.

“Do you find a replica of the person you had before? What are you looking for? Do you change your taste? It occurred to me I’m not sure Gemma really knows what she’s looking for and what her taste is but certainly in episode one, it’s all activated by the arrival of Simon. I think that’s crucial. She wouldn’t have gone on a date normally but it’s having to avoid the (Simon and Kate) wedding party that means she goes on that date.

“So she’s already starting to change herself because of the arrival of Simon, which means everything in her life is centring around this one person who she hates most in the entire world. It’s that contradiction which I think is at the heart of this series.”

If you thought series one was tense, prepare yourselves as these next five episodes are set to get even darker.

But while Simon became one of the nation’s most disliked characters, Suranne feels Gemma is equally flawed.

“They can (both) be unlikable people and what betrayal does to a person can make them ugly. Gemma doesn’t behave well. Before, she did that through hurt and now she’s channelling her anger, it becomes dark and twisted.”

Since series one, Suranne has won a TV Bafta and a National Television Award for her memorable performance. She’s also become a mum for the first time.

“I could’ve played a mother without being a mother. I have played mothers without being a mother but I think what it (motherhood) did do, is make me realise the gravitas of that unit falling apart because I’d go home at night and I’d have a baby to put to bed,” says the actress, who hails from Oldham in Greater Manchester.

“I think it definitely made me realise when two people get together and have a child out of love and then split, what it is to parent a child and be in each other’s lives when you are damaged and hurt without damaging and hurting a child? It certainly made me more aware of that.”

Asked if they’ll be back for a third series, Mike ambiguously, and a little ominously, says: “It depends on what happens in this series really.” But then this is the man who prefers to keep people on their toes.