<p>A locking device for use with scaffolding apparatus is provided the scaffolding apparatus comprising a first pole having a projection, one or more further poles for coupling to the first pole and a collar having an aperture through which the first pole may pass. The collar further comprises a channel through which the projection may pass. The channel forms part of the aperture, wherein the collar is adapted to be slidably mounted to the first pole such that it may only pass the projection when the projection is aligned with the channel. The apparatus is adapted such that, in use, the collar is slid past the projection of the first pole and further moved to an engagement position in which the first and further poles are fixed in relative orientation by engagement with the collar. The locking device is adapted in use to be coupled to the apparatus such that the collar is prevented from sliding past the projection.</p>
