What can you tell us about your character and this series of W1A?

Ian Fletcher’s bedside reading is currently 'The Sinking of the Titanic and Other Psychological Conditions' and 'Optimism in a Post-Truth World'. So he is very much keeping a positive outlook while at the same time testing the emotional lifeboats.

Is life getting any easier for Ian?

I think to say that life is getting easier would be an overstatement, but often within overstatements are kernels of truth and frequently at the nub of a kernel can be found the essence of possibility. Options are there to be explored for Ian, some will be more positive than others but ultimately he has a sense of loyalty to those on the bridge with him.

What is the romantic outlook like for Ian?

This is an area, like that of photographs of lost pets, that Ian keeps close to his chest. While certainly romance is something he would consider, really the job comes first. It would be unprofessional of him to spend time in the engine room when really his role is to be on the bridge avoiding icebergs.

You have played Ian for five series now (in predecessor series Twenty Twelve and W1A), how long does it take to get back into character?

As well as conventional immersion methods and chanting, I tend to use the Patsy Rodenberg grunting technique in my quest to locate Ian.

By lunch time I have usually found him.

How do you find working with writer and director John Morton?

John is a very good director who has been handed a complete turkey of a script by whoever wrote this stuff and he struggles manfully against the odds on a daily basis. On a more serious note, I have nothing but admiration for John, a man who doesn’t get out much but who has a superb ear for the meaningless drivel many of us use when pretending to communicate.

What’s your favourite storyline of the series?

The escalating crisis within the mind of Anna Rampton is a great thread to follow. We know her as an ice maiden but somewhere inside there is a 14 year old panicking to get out. The lengths she goes to put herself in Ian’s path, particularly when he has his cycling outfit on, is very funny. And I love the fact that in the denouement she tries to present Ian's destiny as a fait accompli.

Is there anyone you particularly enjoy playing opposite or watching them work?

Hugh Skinner's character has a vocabulary of about four words to play with but Hugh (Skinner) uses them with such precision; he's immensely skilful and makes it look effortless. When watching Jessica Hynes you think at first she's sculpting jelly then suddenly it sets and it’s sublime. Who do I like acting opposite? "They're all marvellous, darling."

Why is W1A so popular?

Some people misconstrue it as a satire about the BBC. It's not, any more than Twenty Twelve was a satire about the Olympics. It's actually just a framework for seeing characters who are on the whole incapable of achieving what's in their job description. Some of the characters are idiots, some are endlessly doing battle with idiots - and I think we can all identify with those situations, whether we're on the fundraising committee for the village cricket pavilion, or in President Trump's cabinet.

W1A, Mondays from Sept 18 at 10pm.

Interview supplied by the BBC.