Coalitions make for drama, and for comedy. We know that from, respectively, Borgen and the final series of The Thick of It. It is little wonder therefore that soon after the 2010 election delivered a hung Parliament, the National Theatre commissioned a play. And yet the drama that emerged was not about deals struck in back rooms by the Cameron-Clegg government. Instead, This House spirits its audience back to 1974, the year Labour embarked on five years’ of horse-trading as it sought to govern the country with an overall majority of three.

Populist playwright Peter Shaffer, who died in June, gets a rapid honour from this flagship venue, which – aptly enough – is putting on his most popular play. So popular in fact that it has already sold out and is therefore critic-proof. Directed by one of our best youngish directors, Michael Longhurst, and with live music by the Southbank Sinfonia, this spectacular show is certainly a hugely entertaining evening.

Some have responded to the very notion of a musical about cancer as if the idea itself were breaking some unwritten code of what is permissible to put on stage – which seems a bit rich given that the same genre has accommodated pieces about AIDS (Falsettos, now being revived on Broadway), cannibalism (Sweeney Todd) and even singing-dancing pussycats (um, Cats).

At first, I was a bit confused by the play’s title. After all, David Hare gave his 1998 adaptation of Arthur Schnitzler’s La Ronde the moniker of The Blue Room, which coincidentally is the same title as Mathieu Amalric’s very recent adaptation of a thriller by Georges Simenon. Now Hare has taken another Simenon thriller, La Main, and called it The Red Barn, which immediately suggests the murder of Maria Marten in 1827.

"Yes, from life," Nikolai Ivanov (Geoffrey Streatfeild) says in passing of a painting midway through the early Chekhov play that bears his name. But the phrase could serve as the abiding achievement of the largely thrilling triptych of plays that has transferred from Chichester to the National under the banner title Young Chekhov.

From being the Aunt Sally of contemporary British theatre, attacked by the angry young men in the 1950s and the new wave of social and political realists for three decades after that, playwright Terence Rattigan is now well and truly rehabilitated. For the past quarter of a century, both his major and his minor works have been regularly revived.

Last seen at the National Theatre over 10 years ago, Brecht and Weill’s The Threepenny Opera is back in a new adaptation by Simon Stephens. But looking at Rufus Norris’s epic-theatre-lite production – all exposed stage-mechanics and makeshift sets – and listening to Stephens’s brutal but non-committal text, you’d swear it had never been away. There’s no aggressive update, no attempt to reinvent or make relevant, and the result is a clean, cold stab of a show, a theatrical assault every bit as cool and casual as Mack’s own murders.

Why do young British Muslims go to join the so-called Islamic State? Since the entire media has been grappling with this question for ages now, it is a bit puzzling to see our flagship National Theatre giving the subject an airing, especially as this is a verbatim drama, which uses the actual words of interviewees, and is thus not so very different from ordinary journalism. But if Gillian Slovo’s Another World: Losing Our Children to Islamic State aspires to be a stage piece, how does it work?

The interviewees’ accounts are never questioned

Lorraine Hansberry’s career as a playwright proved tragically short. A Raisin in the Sun is by some distance her best-known work, a key piece about the African American post-war experience. But she thought Les Blancs (The Whites) was potentially her most important play, although it remained unfinished at her death in 1965, aged only 34; it was assembled from drafts by her ex-husband and executor Robert Nemiroff, finally reaching Broadway in 1970.   

With the 50th Brighton Festival taking place this year, Festival CEO Andrew Comben meets theartsdesk for a chat about the original 1967 event, and its relationship with this year’s Festival. Comben has been the Brighton Festival's overall manager since 2008, also overseeing the Brighton Dome venues all year round. He shares the festival’s curation this year with Guest Director Laurie Anderson.