The disappearance of Lord “Lucky” Lucan in 1974 remains one of the most teasing enigmas of recent-ish history. Following the collapse of his marriage and a bitter battle with his wife Veronica for custody of their three children, the gambling addict Lucan is presumed to have battered the children’s nanny to death, attacked his wife, then fled the country by boat from Newhaven. Elvis-like sightings of the disgraced peer have poured in from around the world ever since.

The comedy of manners is not dead. It’s alive and kicking, often literally, at this north London venue in actor Simon Paisley Day’s new play. Although the title suggests a group of teenagers dancing in a warehouse, the actual subject of the play is a handful of couples who have left their children behind in order to spend three days relaxing in a remote countryside location. Throw in one or two wild cards and this laughter machine is soon turning over.

British theatre is obsessed with the new, with novelty. And one of the obvious casualties of this is old plays that are not by Ibsen or Chekhov. Plays that feature in every history of British theatre, such as Arnold Wesker’s 1959 classic, Roots, about the political and sentimental education of Beatie Bryant, with its uplifting final scene of her self-awakening. At last, this revival gives us all the chance to watch a legendary piece of our cultural history.

Arnold Wesker has a theory that plays require a certain DNA to endure. When thoughts turn to the 1950s and the revolution in British theatre which allowed ordinary working-class life up onto the stage, the name which always comes up is John Osborne. And yet the game-changing Look Back in Anger now looks like a bloated and tiresome rant. Wesker’s work has stood the test of time far more robustly.

Knock knock. Who's there? Eamonn. Eamonn who? Eamonn Etonian. There's an Eamonn at No 10, an Eamonn is Mayor of London, an Eamonn is even Archbishop of Canterbury. Oh, and Eamonns are third and - for three more months - fourth in line to the throne. Recently Eton has started to dominate British film, television and theatre. In 2012 one Eamonn won an Emmy, another was given a Bafta and a third played a Shakespearean king on the BBC. 

The play is the thing, to quote one famous bereaved theatrical son, and in this new collaboration between Theatr Genedlaethol Cymru, artist Marc Rees and playwright Roger Williams, it is most definitely the thing. A Welsh-language multi-media promenade production that takes as its themes the erosion of the traditions of agricultural communities, Tir Sir Gâr is a complex balancing act between fact and fiction, and between emotional, involving drama and cold introspective installation art. The balance is delicate, sometimes successful and sometimes not.

Most of us would love to live in a happy family, but it’s the unhappy ones that make the most compelling drama. And few playwrights do familial tensions as instinctively as Polly Stenham, whose highly successful 2007 debut That Face and 2009 follow-up Tusk Tusk both explored the tensions between parents and children. In her new play, she revisits the mother-son relationship, and adds some thrilling twists to the bubbling brew.

The word “people” of the title of Alan Bennett’s new play is to be spat out, like a lemon pip. People, who invade your space, boss your values, make you be what they want. So does the beleaguered Lady Dorothy Stacpoole feel about the stark options facing her as her fantastically grand mansion leaks and crumbles over her smelly, freezing feet, while under it groans ancient mine workings like a whale with toothache.

At boarding school in the mid-1970s Matron – a grey-haired, sharp-beaked stick of a woman who put the fear of God into us – would often remark: “Remember, boys, always be polite to the lower orders.” She was referring to the army of cleaning and kitchen staff who kept the lino lethally polished and our stomachs full of stodge. It was as if the swinging Sixties had never happened. Even when the power was cut off during the winter of discontent there was always plenty of hired help to light the candles.