A swivel bracket for mounting a headrail having inwardly facing parallel outer and inner beads (12,14), the swivel bracket including: a holder including a mounting portion configured to be mounted to an architectural structure and a support portion extending in a first direction and configured to support the headrail extending in a second direction perpendicular to the first direction, the support portion having a support leg configured to span the headrail from the inner bead to the outer bead, the support leg having, at a distal end, a hook portion configured to receive and support an underside of the outer bead; and a swivel member mounted to a pivot on the holder and rotatable between an open position and a closed position, the pivot having an axis of rotation in a third direction perpendicular to the first and second directions, the swivel member having an inner leg extending from the pivot and an outer leg extending from the pivot, the inner leg having, at a rear distal end, a tab configured to support an underside of the inner bead, and the outer leg having, at a front distal end, a flange configured to engage with an outer surface of the outer bead; wherein: in the open position, the flange is spaced from the hook portion and the tab is located towards the hook portion, thereby allowing the outer bead to be received and supported by the hook portion and the inner bead to be located adjacent the support leg, and, in the closed position, the flange holds the outer bead in the hook portion and the tab supports the underside of the inner bead; and the outer leg includes, spaced inwardly of the flange towards the pivot, a protrusion configured, in the closed position, to engage with an inner surface of the outer bead, the inner surface facing the inner bead, thereby resisting rotation of the swivel member to the open position, characterized in that the protrusion is extending at least partly parallel with the flange. a holder including a mounting portion configured to be mounted to an architectural structure and a support portion extending in a first direction and configured to support the headrail extending in a second direction perpendicular to the first direction, the support portion having a support leg configured to span the headrail from the inner bead to the outer bead, the support leg having, at a distal end, a hook portion configured to receive and support an underside of the outer bead; and a swivel member mounted to a pivot on the holder and rotatable between an open position and a closed position, the pivot having an axis of rotation in a third direction perpendicular to the first and second directions, the swivel member having an inner leg extending from the pivot and an outer leg extending from the pivot, the inner leg having, at a rear distal end, a tab configured to support an underside of the inner bead, and the outer leg having, at a front distal end, a flange configured to engage with an outer surface of the outer bead; wherein: in the open position, the flange is spaced from the hook portion and the tab is located towards the hook portion, thereby allowing the outer bead to be received and supported by the hook portion and the inner bead to be located adjacent the support leg, and, in the closed position, the flange holds the outer bead in the hook portion and the tab supports the underside of the inner bead; and the outer leg includes, spaced inwardly of the flange towards the pivot, a protrusion configured, in the closed position, to engage with an inner surface of the outer bead, the inner surface facing the inner bead, thereby resisting rotation of the swivel member to the open position, characterized in that the protrusion is extending at least partly parallel with the flange. in the open position, the flange is spaced from the hook portion and the tab is located towards the hook portion, thereby allowing the outer bead to be received and supported by the hook portion and the inner bead to be located adjacent the support leg, and, in the closed position, the flange holds the outer bead in the hook portion and the tab supports the underside of the inner bead; and the outer leg includes, spaced inwardly of the flange towards the pivot, a protrusion configured, in the closed position, to engage with an inner surface of the outer bead, the inner surface facing the inner bead, thereby resisting rotation of the swivel member to the open position, characterized in that the protrusion is extending at least partly parallel with the flange.