A connector holder suitable for use in a communications signal distribution system, comprising first and second parts between which an optical connector element may be secured, and which have means for locating the holder in one of a number of different positions and/or orientations on a base or other support of an optical fibre termination unit, whereby to permit a selected one of a number of different connector elements to be held between the two parts of the connector holder, and means for holding the two parts together with a connector element between them.