A cable tie arrangement for bundling one or more elongate members, and which includes a continuous strap having a planar surface free of any racks and a separate locking head defining an opening and having a metal locking element with a pair of opposed teeth extending into the opening and arranged to engage the strap in the opening. In use, a looped section of the strap bundles one or more elongate members on a first side of the locking head, and the looped section has an end section and a supply section extending through the locking head to a second side of the locking head in a first direction. Further, the opposed teeth are arranged to engage the planar surface of the end section and the supply section to prevent movement of the end section and the supply section in a second direction opposed to the first direction and to allow movement of the supply section in the first direction, and wherein the opposed teeth extend towards one another in the opening to press the end section and the supply section together in the opening.