A foam generating spray head comprising: a body, a chamber formed in the body and being in communication with the atmosphere, an elongate foam generating outlet bore formed in the body and extending in a first direction from the chamber to an outlet of the body, a detergent inlet aperture in a surface of the chamber, said inlet aperture communicating with a liquid supply arrangement and being for communication with the interior of the container, and a water inlet for the chamber and being configured to direct a jet of water over said detergent inlet aperture and into the chamber in said first direction towards the foam generating outlet bore, said water inlet and said detergent inlet aperture being co-configured so that passage of said water jet over said inlet aperture causes detergent from the container to be drawn into the chamber, wherein the inner surface of the foam generating outlet bore is formed as an aerating surface, the surface of the chamber in which the detergent inlet aperture is provided has a configuration to cause a diverging flow of detergent into the chamber towards the foam generating outlet bore, the surface of the chamber in which said detergent inlet aperture is provided is inclined such that a notional line drawn through the centre of the water inlet and extending in the first direction meets the surface of the chamber in which the detergent inlet aperture is provided at a point downstream of said aperture, and at its upstream end the outlet bore is of increased cross-sectional area as compared to the downstream end of the chamber with which it communicates, wherein the bore is uninterrupted along its length and across the major part of its cross sectional area save for the provision of the aeration surface, and wherein said increased cross-sectional area is provided by a shoulder at the upstream end of the outlet bore. a body, a chamber formed in the body and being in communication with the atmosphere, an elongate foam generating outlet bore formed in the body and extending in a first direction from the chamber to an outlet of the body, a detergent inlet aperture in a surface of the chamber, said inlet aperture communicating with a liquid supply arrangement and being for communication with the interior of the container, and a water inlet for the chamber and being configured to direct a jet of water over said detergent inlet aperture and into the chamber in said first direction towards the foam generating outlet bore, said water inlet and said detergent inlet aperture being co-configured so that passage of said water jet over said inlet aperture causes detergent from the container to be drawn into the chamber, wherein the inner surface of the foam generating outlet bore is formed as an aerating surface, the surface of the chamber in which the detergent inlet aperture is provided has a configuration to cause a diverging flow of detergent into the chamber towards the foam generating outlet bore, the surface of the chamber in which said detergent inlet aperture is provided is inclined such that a notional line drawn through the centre of the water inlet and extending in the first direction meets the surface of the chamber in which the detergent inlet aperture is provided at a point downstream of said aperture, and at its upstream end the outlet bore is of increased cross-sectional area as compared to the downstream end of the chamber with which it communicates, wherein the bore is uninterrupted along its length and across the major part of its cross sectional area save for the provision of the aeration surface, and wherein said increased cross-sectional area is provided by a shoulder at the upstream end of the outlet bore.