A door stop apparatus (10) comprising a blocking mechanism (12); an operating mechanism (14); and a mechanical linkage (16,18) for coupling the blocking mechanism (12) to the operating mechanism (14). The blocking mechanism (12) comprises a blocking member (20) movable between a blocking state and non-blocking state under control of the operating mechanism (14) via the mechanical linkage (16,18). The mechanical linkage (16,18) is dimensioned so that the operating mechanism (14) may be located remotely of the blocking mechanism (12). When installed, the spacing between the blocking mechanism (12) and the operating mechanism (14) is such that a person located outside the door is unable to operate the operating mechanism (14) using an unaided limb, while a person located inside the door is able to operate simultaneously both the blocking mechanism (12) and the operating mechanism (14).