The water proves newly inviting in The Deep Blue Sea, Terence Rattigan's mournful 1952 play that some while ago established its status as an English classic. Lindsay Posner's production, first seen in Bath with one major change of cast since then, takes its time, and leading lady Tamsin Greig often speaks in a stage whisper requiring you to lean into the words. (This is that rare production that, praise be, is unamplified.) 

It's one thing to be indebted to a playwright, as Tom Stoppard and Harold Pinter have been at different times to Beckett, or Sondheim's latest musical is to Sartre. But Conor McPherson's The Brightening Air – the title itself is derived from Yeats – comes so fully steeped in Chekhov that you may wonder whether this portrait of rural Ireland in 1980s County Sligo hasn't bled into provincial Russia from nearly a century before, or vice-versa.

From the creative team that brought you The Play That Goes Wrong in 2012 (and assorted sequels) comes this spy caper. As ever with Mischief productions, their latest work is a lot of fun and pays its dues to the great age of British farce (and pantomime too) with clever wordplay and physical comedy as things go increasingly awry.

There is so much that is right about Jonathan Kent’s new production of House of Games – the casting, the staging, the direction. But the flaw it can’t overcome is that the 1987 David Mamet screenplay on which Richard Bean based this stage version in 2010 has been transformed from a vicious psychologically tough caper-movie into an almost jaunty puzzle-play, its sharp teeth removed.

You don't have to be greeting the modern day with a smile unsupported by events in the wider world to have a field day at Here We Are. The last musical from the venerated Stephen Sondheim has only grown in import and meaning since I caught its New York premiere some 18 months ago.

When Mark Rosenblatt was preparing his debut play, the miseries of the assault on Gaza were still over the horizon. Now they are here, another terrible moment in human history that resonates all through Giant. Since the play opened at the Royal Court last year, that ugly hum has grown even louder. Now transferred to the West End, it could have been written to give dramatic form to this most incendiary of talking points.

Watching the stricken faces on the split screen, I felt at times like callow Farfrae in Hardy’s The Mayor of Casterbridge: when faced with Henchard’s account of his blackest misery, the young man replies “Ah, now, I never feel like it”. Well, hardly ever. It’s impossible not to be held captive by the eyes and words of the six actors sharing the roles of estranged father, mother and son in Nobel Prize winning Norwegian writer Jon Fosse’s Einkvan (Everyman).

There was a time when the only daytime TV (ex-weekends and ex-Wimbledon fortnight) comprised the annual party conferences and the Trade Union Congress. A seemingly endless parade of indistinguishable middle-aged balding white men, with Barbara Castle’s fiery redhead and Margaret Thatcher’s immovable blonde hairdo the only relief, would grab 15 minutes of fame speechifying on the minutiae of policy, some puffing on pipes, some on full-strength Capstans.

In Dublin, a city that has changed more than most in the last 30 years, a young woman, with an English accent that is expensive to acquire, is cycling through sexual partners. We eavesdrop on their conversations, witness the physical intimacy fade as the psychological intimacy hesitantly grows, in that strange vacuum in which you realise that you know everything and nothing about the person in front of you.

Holsters, Stetsons and bluegrass music bring a distinctive flavour to this Wild West riff on Romeo and Juliet that flings us into a vortex of frontier-town politics where men are men and bad girls wear gingham. Sean Holmes’ vigorous production stirs up the original to prove that cowboys can be zombies and that you should always bring a gun to a knife-fight.