It is a measure of the ridiculousness of sectarian expression in Scottish football that, when the lights are flicked on in Billy and Tim's police cell, revealing their respective Rangers and Celtic shirts to mutual howls of anguish,  Des Dillion's play scarcely feels contrived thereafter.

Revived by NLP Theatre, this consistently funny yet highly authentic representation of attitudes either side of the Old Firm divide heaps scorn on the idea of 90-minute bigots, with the perceptive but lairy Billy (Scott Kyle) and the less bright but more open Tim (Colin Little) instinctively bickering and chanting their way through every entrenched, historical cliche of "huns" and "Fenian scum", before eventually arguing themselves towards a "ceasefire" and qualified understanding. Locked up during the derby game, they squabble as their jailer, Harry (James Miller), frets about his grandson undergoing a potentially fatal operation.

For Harry, there's no question of football being more important than life and death and it's empathy that ultimately moves these family men from dubious family traditions to periodic reasonableness, even as the TV visible through the cell door inflames their passions. Dillon perceptively extends the grasp of his inquiry beyond sport and religion to specific questions of Scottish culture and Christian identity, yet though the intent is worthy, the tone is rarely so. Any preaching is forestalled by the play's boisterous wit and the sense that this is a solitary, if hopeful reconciliation, with both sides achieving a result in the end.