A moulded plastics article 1 comprises a hollow body with a lower portion 2 and an upper portion 3. In a desired in-use orientation of the article, the lower portion 2 of the body is lowermost and the upper portion 3 is uppermost. The article has an integrally moulded ballast which in this case is in the form of a number of inwardly projecting ribs 10 which extend generally radially from the wall of the lower portion of the hollow body. The ribs 10 are of different lengths, the longer ribs being provided at the lowest section of the body and the radial extent of the ribs decreasing upwardly. The thickness of the outer wall of the hollow body and the thickness of the ribs 10 is substantially the same. Thus the article has substantially uniform wall thickness.