A dead body - check; an engaging cast of characters - check; and a mystery to solve - check.

So press "play" and we are box set ready to go. But what happens if by episode three the tension has fallen away and all the untied plot strands dangle annoyingly? According to one leading British writer, this is now the fate of too many television dramas as the demand for fresh entertainment cranks up.

Chris Lang, the creator of ITV's returning cold case detective series Unforgotten, has questioned a commissioning culture that can oblige writers to deliver at breakneck speed to feed the beast of box-set production.

 Sanjeev Bhaskar and Nicola Walker in Chris Lang's television series, Unforgotten.
Sanjeev Bhaskar and Nicola Walker in Chris Lang's television series, Unforgotten.

In an interview with the Observer, Lang said: "You can definitely spot the shows where the writers clearly didn't quite know where it was going to end. It happens particularly in longer shows, with six episodes or more. You can see when they had no idea, and then they often leave it hanging, hoping to get a second series."

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Lang, who also scripted Sirens, Torn, Undeniable and A Mother's Son, is one of the British writers who have benefited from the great boom in television drama over the last five years. He acknowledges the best shows have high standards, but argues no drama series should go into production before the creative team has thought their story through.

"Having it sorted in advance is incredibly important," he said. "We are all enjoying this golden age of television drama but you would not believe how many shows start preproduction with only two or three scripts ready. The writers are still writing as they start filming. To me that is an absolutely insane way to work."

British production companies have realised that hit dramas are vital to their survival. Broadcast magazine's latest annual survey of independent programme makers found that revenues at the top five companies making drama (Carnival, the maker of Downton Abbey and Whitechapel; Left Bank, the maker of The Crown; Kudos, which makes Humans; Bentley, Midsomer Murders; and Neal Street, Call the Midwife) are all up more than 30% on last year. Meanwhile, subscription broadcasters such as Sky, Netflix and Amazon are investing heavily in drama, alongside the traditional terrestrial channels.

As the golden age of the box set enters its second phase, there are murmurings from writers' rooms in Britain and America. If audiences want hit series that will truly entertain them, there must be enough time to create them.

Rory Kinnear in the television series, Penny Dreadful.
Rory Kinnear in the television series, Penny Dreadful.

Although Lang has co-written a new show, Innocent, with thriller novelist MJ Arlidge, he usually writes alone. He admires the distinctive tone of Sally Wainwright, creator of Happy Valley and Last Tango in Halifax, and of the Catastrophe co-writer Sharon Horgan. He also enjoys US shows such as The Affair, which stars British actors Ruth Wilson and Dominic West, and Divorce, which is also by Horgan and stars Sarah Jessica Parker.

"It is the little flourishes in these scripts that make them feel real and truthful," Lang said. "And sadly these are the first casualties when time is short and the plot has to take precedence."

Lang said his work is usually complete before production. "Why would you not do it like that? You have got 60 or 70 people waiting for you, not including the actors, and they need to set up a shooting schedule. If you have it all done they can schedule it in blocks, which means you can save money and then spend it in the right way, making the show look fantastic."

Scene from television series, Downtown Abbey.
Scene from television series, Downtown Abbey.

His new series of Unforgotten starts on Thursday (9pm, ITV) with the discovery of a body in a sealed suitcase in London's river Lea. The detective duo played by Nicola Walker and Sanjeev Bhaskar then have to trace back the story, drawing in four apparently unconnected suspects. "If you are half-good at your job, you should have a vision and absolutely know where it is ending," said Lang.

Neal Street's Dame Pippa Harris agreed that producers prefer a finished script so that budgets can be spent wisely. "When we made Penny Dreadful for Sky, it was a huge advantage that John Logan had written the entire first series before we began," she said.

"But ultimately it depends on the writer, and some people produce their best work under the pressure of production. I remember that when we greenlit Paul Abbott's State of Play at the BBC, he had only written the opening episodes and had no clear outline for where it was going. Likewise, Jez Butterworth, who I've been working with recently on Britannia for Sky, has relished the freedom of altering storylines and character arcs in later episodes."

A scene from the television series, Humans.
A scene from the television series, Humans.

The first great golden age of television was in the 1950s and 60s, when limited channel choices meant that a few shows achieved cultural dominance. Writers tended to stick to the same shows and with the same on-screen talent.

Now, with hundreds of scripted television shows on air in a year, it is impossible for quality to be widespread. Writers are more often freelancers, who must keep several plates spinning.

Notwithstanding his reservations, Lang, who writes at least 10 drafts of each of his scripts, emphasises that he is "rejoicing with my fellow writers at how ascendant television is. I can't remember a time when there was so much good stuff on."

- The Observer