Even by Stanley Kubrick’s standards, Dr Strangelove went through an extraordinary evolutionary process. After starting it off as a serious film about nuclear war based on the 1958 novel Two Hours to Doom, he decided to turn it into a comedy with the help of porn-obsessed satirist Terry Southern.

"Captain" Jack Boyle is a fantasist, a mythmaker, a storyteller. He relishes an audience – usually his sidekick, Joxer. There is a theatricality in his part as written by O'Casey, but in Matthew Warchus's hands this is made an explicit element of the whole production, culminating in the unexpected finale. When the first scene opens, swags of red stage curtains rise and remain looped in place throughout, framing the action.

Modernism is us. Today. For the past two decades plays by Samuel Beckett and Harold Pinter – which once upon a time bewildered their audiences and gave critics apoplexy – have become big West End hits. The avant-garde is now commercial. The incomprehensible is our reality.

Pete Waterman, responsible (some might prefer the word guilty) for more than 100 Top 40 hits, said that a pop song is the hardest thing to write. Boy meets girl; boy loses girl; boy gets girl back – all wrapped up in three minutes. Benedict Lombe’s Shifters takes longer – 33 Kylies longer – but it pulls off the same devilishly difficult trick and, as with the best earworms of the 1980s, it’s likely to stay in your head for years.  

Before the Plays That Went Wrong and the multi-role six-hander Operation Mincemeat, there was Patrick Barlow’s adaptation of The 39 Steps: four actors on a collision course with feasibility.

On opening night, there’s always a little tension in the air. Tech rehearsals and previews can only go so far – this is the moment when an audience, some wielding pens like scalpels, sit in judgement. Having attended thousands on the critics’ side of the fourth wall, I can tell you that there’s plenty of crackling expectation and a touch of fear in the stalls, too. None more so than when the show is billed as a new musical.

Five years ago, Rachel Parris tells us, she never thought she would one day be married, a mother and a home owner. Now she's all three – and a stepmother as well – and this year is about to turn 40. It's quite a journey, which she talks about in her new show, Poise.

For fans of a certain age the name Jack Docherty will always be associated with a very good run of chat shows on Channel 5; he was also the star of Channel 4's sketch show Absolutely and more recently the Scottish comedy Scot Squad. And now he's on the road with David Bowie & Me – Parallel Lives, a sort of memorial to lost youth but also the life-affirming joy of music.

Small-scale shows, nurtured in offbeat places, are becoming all the rage in the West End. Red Pitch, Operation Mincemeat, For Black Boys… have already made their mark, and now this quirky musical for just two performers joins them.

If you don't like sweary comics – Jonathan Pie uses the c-word liberally – then this may not be the show for you. In fact if you're a Tory, ditto, because it is 70 minutes of political invective, taking aim at a rogues' gallery of senior Conservatives present and past. Oh, and the royal family get it in the neck too.