A temperature-controlled mixing valve for installation within a cavity, the temperature-controlled mixing valve comprising an input for hot water, an input for cold water, an output (91,92) for mixed water, a flow control (24,34) to regulate flow rate through the valve, a mixing module for combining flows from the hot and cold inputs for flow to the output, and a cover plate for covering the cavity; the mixing module comprising a temperature regulating mechanism for controlling the respective hot and cold flow rates relative to one another to change or control the water temperature at the output; the temperature regulating mechanism comprising an adjuster mechanism having a temperature regulator member coupled to an external temperature control member having a peripheral radially outwardly directed grip surface for actuation by a user to adjust the regulated temperature, and wherein (i) the temperature regulator mechanism has a temperature regulator adjustment axis and is disposed with its temperature regulator adjustment axis lying parallel to a plane of movement of the external temperature control member, and/or (ii) the external temperature control member and the temperature regulator member are coupled to move together by means of a geared coupling including a first gear connected to rotate with or be rotated by the external temperature control member, and a second gear connected to rotate with the temperature regulator member of the adjustment mechanism; characterized in that, at all times including when in use for actuation, an outermost surface of the external temperature control member is substantially flush with, or recessed relative to, an outward surface of the cover plate. the mixing module comprising a temperature regulating mechanism for controlling the respective hot and cold flow rates relative to one another to change or control the water temperature at the output; the temperature regulating mechanism comprising an adjuster mechanism having a temperature regulator member coupled to an external temperature control member having a peripheral radially outwardly directed grip surface for actuation by a user to adjust the regulated temperature, and wherein (i) the temperature regulator mechanism has a temperature regulator adjustment axis and is disposed with its temperature regulator adjustment axis lying parallel to a plane of movement of the external temperature control member, and/or (ii) the external temperature control member and the temperature regulator member are coupled to move together by means of a geared coupling including a first gear connected to rotate with or be rotated by the external temperature control member, and a second gear connected to rotate with the temperature regulator member of the adjustment mechanism; (i) the temperature regulator mechanism has a temperature regulator adjustment axis and is disposed with its temperature regulator adjustment axis lying parallel to a plane of movement of the external temperature control member, and/or (ii) the external temperature control member and the temperature regulator member are coupled to move together by means of a geared coupling including a first gear connected to rotate with or be rotated by the external temperature control member, and a second gear connected to rotate with the temperature regulator member of the adjustment mechanism; characterized in that, at all times including when in use for actuation, an outermost surface of the external temperature control member is substantially flush with, or recessed relative to, an outward surface of the cover plate.