A barrier assembly comprising: a barrier having a longitudinal generally horizontal length provided by first and second slidably coupled barrier members (22, 23), with relative sliding longitudinal movement between the barrier members (22, 23) providing for adjustment of said length; and at least one upright attached to said barrier members (22, 23) to support said barrier members, said upright being capable of being attached to a supporting surface, characterised in that said upright is a frame extending laterally from said barrier to engage said surface so as to extend upwardly from said surface, said frame comprising: an upright post in use extending upwardly from said surface; an outer upright post extending upwardly from said surface; a bottom plate joining said upright post and said outer upright post; a transverse brace joining said upright post and said outer upright post at their upper ends; and a clamp operable to releasably secure the barrier to the frame so as to support the barrier and to provide a desired length for said barrier, said clamp comprising an upright arm pivotally mounted to said transverse brace for angular movement about a horizontal axis between a release position and a clamp position wherein said barrier is clamped between said upright arm and said upright post, said horizontal axis being parallel to and spaced from said barrier. a barrier having a longitudinal generally horizontal length provided by first and second slidably coupled barrier members (22, 23), with relative sliding longitudinal movement between the barrier members (22, 23) providing for adjustment of said length; and at least one upright attached to said barrier members (22, 23) to support said barrier members, said upright being capable of being attached to a supporting surface, characterised in that said upright is a frame extending laterally from said barrier to engage said surface so as to extend upwardly from said surface, said frame comprising: an upright post in use extending upwardly from said surface; an outer upright post extending upwardly from said surface; a bottom plate joining said upright post and said outer upright post; a transverse brace joining said upright post and said outer upright post at their upper ends; and a clamp operable to releasably secure the barrier to the frame so as to support the barrier and to provide a desired length for said barrier, said clamp comprising an upright arm pivotally mounted to said transverse brace for angular movement about a horizontal axis between a release position and a clamp position wherein said barrier is clamped between said upright arm and said upright post, said horizontal axis being parallel to and spaced from said barrier. an upright post in use extending upwardly from said surface; an outer upright post extending upwardly from said surface; a bottom plate joining said upright post and said outer upright post; a transverse brace joining said upright post and said outer upright post at their upper ends; and a clamp operable to releasably secure the barrier to the frame so as to support the barrier and to provide a desired length for said barrier, said clamp comprising an upright arm pivotally mounted to said transverse brace for angular movement about a horizontal axis between a release position and a clamp position wherein said barrier is clamped between said upright arm and said upright post, said horizontal axis being parallel to and spaced from said barrier.