The indefatigable James Graham already has one political play, Tory Boyz, on in London at the Soho Theatre. There are no Conservatives in Sons of York but there soon will be since it focuses on the 1978-9 Winter of Discontent that led to the collapse of Callaghan’s ailing Labour administration.

Winds of change are rattling through the nation and three generations of an affectionate, fractious working-class family, huddled together under one terraced roof to save on fuel. There are several low-flying ­allusions to our current political woes, and Graham does a nifty job of introducing salient elements of the bigger picture — ­electricity failures, picket lines — into these unassuming lives.

But the stand-off between old socialism and new individualism is thumpingly schematic at times; when granddad Terry (William Maxwell) and grandson Mark (excellent Steven Webb) arm ­wrestle, it’s as if Attlee is challenging Thatcher. Director Kate Wasserberg does her best to keep things human rather than allegorical but Graham occasionally makes this hard for her.

Sons of York, until 27 September (0844 847 1652).