The Anniversary is a determinedly old-fashioned physical comedy. A couple prepare for their 50th anniversary party, only to find themselves defeated by weather, clumsiness and the rigours of old age. Climaxing in a knife fight, they not only destroy their elegantly presented buffet, but even the pet rabbit and their entire relationship. The humour is broad, the slapstick straightforward and, while there is an undercurrent of discomfort (these are pensioners eating cat food and losing control of their bodily functions), the tone is consistently jocular.

Although there’s plenty of energy from the duo, and a charming guest appearance from a puppet cat, the humour disguises a lack of depth in the characterisation. Both Barb and Jim are stereotypical old people: there are moments of affection but they rarely reveal any connection. If the plot is never sentimental, it also never takes advantage of any potential pathos, leaving it rather mean-spirited in the tormenting of this couple.

The broad strokes of these characters establish a mild antagonism from the first scene and, even as the action escalates through pratfalls towards a deluge that finally sweeps them away, there’s not much development. The Anniversary has plenty of belly laughs but little dramatic tension.

Pleasance Dome, until 28 August, noon.