A workstation services support structure including a beam supported at or near desk height on one or more legs is described. The beam includes one or more elongate mounting means extending substantially along its length. Each elongate mounting means corresponds to a zone (Zones 1 to 4) in which one or more accessories to support a workstation service can be movably mounted with respect of the beam to enable service delivery at a user selectable position within the zone. The support structure includes a plurality of zones (Zones 1 to 4) that can be defined to be non-overlapping such that an accessory mounted within one zone does not interfere with an accessory mounted within another zone. Legs, accessories and couplings and systems incorporating such elements are also described.