A mounting assembly (101, 201, 301, 401) for mounting an accessory (102, 202, 302, 402) comprising: a mounting bracket (103, 203, 303, 403) with an aperture (105, 205, 305, 405) arranged to receive a fastener for fastening the mounting bracket to a surface; an elongate hollow member (107, 207, 307, 407) which is releasably securable to the mounting bracket, the mounting bracket and the elongate hollow member having complementary male and female mating formations which are arranged to inhibit rotation of the elongate hollow member relative to the mounting bracket when secured thereto; and a supporting structure configured to be positioned between the mounting bracket and the accessory with, in an assembled condition, the elongate hollow member substantially surrounding the supporting structure, characterised in that the supporting structure includes a projection (129, 229, 329, 429) on the mounting bracket which, in an assembled condition of the assembly, extends into a cavity defined by the hollow member and is configured to engage an internal surface of the elongate hollow member and a cap (131, 231, 331, 431) provided on an open, second end (117, 217, 317, 417) of the elongate hollow member, the cap having an internal portion which extends into the cavity defined by the hollow member and is configured to engage an internal surface of the hollow member, and in that at least two set screws (159, 161, 259, 261, 359, 361, 459, 461) extend through holes (143, 243, 343, 443) in the hollow member on the same side thereof, a first set screw (159, 259, 359, 459) engaging an inclined surface (163, 263, 363, 463) of the projection and the second set screw (161, 261, 361, 461) engaging an oppositely inclined surface (167, 267, 367, 467) of the cap to secure the mounting bracket and cap to the elongate hollow member. a mounting bracket (103, 203, 303, 403) with an aperture (105, 205, 305, 405) arranged to receive a fastener for fastening the mounting bracket to a surface; an elongate hollow member (107, 207, 307, 407) which is releasably securable to the mounting bracket, the mounting bracket and the elongate hollow member having complementary male and female mating formations which are arranged to inhibit rotation of the elongate hollow member relative to the mounting bracket when secured thereto; and a supporting structure configured to be positioned between the mounting bracket and the accessory with, in an assembled condition, the elongate hollow member substantially surrounding the supporting structure, characterised in that the supporting structure includes a projection (129, 229, 329, 429) on the mounting bracket which, in an assembled condition of the assembly, extends into a cavity defined by the hollow member and is configured to engage an internal surface of the elongate hollow member and a cap (131, 231, 331, 431) provided on an open, second end (117, 217, 317, 417) of the elongate hollow member, the cap having an internal portion which extends into the cavity defined by the hollow member and is configured to engage an internal surface of the hollow member, and in that at least two set screws (159, 161, 259, 261, 359, 361, 459, 461) extend through holes (143, 243, 343, 443) in the hollow member on the same side thereof, a first set screw (159, 259, 359, 459) engaging an inclined surface (163, 263, 363, 463) of the projection and the second set screw (161, 261, 361, 461) engaging an oppositely inclined surface (167, 267, 367, 467) of the cap to secure the mounting bracket and cap to the elongate hollow member.