Mary O’Donnell’s Covid-era matriarchal drama Sweep the Cobwebs Off the Sky is a triumph

Kilnavarn House, along with the rest of the country, endures the suffocating disquiet of Covid lockdown. Set deep in the Irish borderlands, the creaking old mansion is home to the very old Elma – ­dependent, incontinent and suffering memory lapses, and yet strong of mind and unapologetic. ­