A thermally sensitive control assembly (2; 2'; 102) for controlling an electrical power supply circuit to a heater in a liquid heating appliance, the control assembly comprising: a cordless electrical connector part (6; 6'; 106) arranged to mate with a corresponding base electrical connector part; first and second moveable electrical contacts mounted on first and second moveable members (16a, 16b; 116a, 116b), each mating with a corresponding fixed electrical contact in the electrical power supply circuit when the first and second moveable members are respectively in a closed position; first and second thermally sensitive actuators (12a, 12b; 112a, 112b), each independently operable at an overheat temperature to move a respective one of the first and second moveable members from the closed position to an open position wherein the first and second moveable electrical contacts are separated from the fixed electrical contacts to interrupt the electrical power supply circuit; and a release member (26; 26'; 126) comprising a release part (28; 128) and a plunger (30; 130) projecting from the cordless electrical connector part; characterised in that the control assembly further comprises: a pivotally mounted latch arm (20; 20'; 120) extending laterally across the control between the first and second moveable members, the latch arm comprising a first latch (22a; 122a) for the first moveable member (16a; 116a) and a second latch (22b; 122b) for the second moveable member (16b; 116b), wherein the release member is resiliently biased to bring the release part into contact with the latch arm but the resilient bias is overcome when the plunger bears against a surface of the corresponding base connector part; wherein, when the cordless electrical connector part is mated with the corresponding base electrical connector part, and when at least one of the first and second moveable members is moved towards the open position, such movement causes the latch arm to pivot so that the respective first or second moveable member moves past the respective first or second latch before the latch arm pivots back to adopt a latching position, in which the first or second latch can prevent the respective first and second moveable member from subsequently moving from the open position back to the closed position; and wherein, when the cordless electrical connector part is separated from the corresponding base electrical connector part, the release part is resiliently biased into contact with the latch arm, thereby causing the latch arm to pivot out of the latching position such that the first and/or second moveable member is no longer prevented from moving from the open position back to the closed position. a cordless electrical connector part (6; 6'; 106) arranged to mate with a corresponding base electrical connector part; first and second moveable electrical contacts mounted on first and second moveable members (16a, 16b; 116a, 116b), each mating with a corresponding fixed electrical contact in the electrical power supply circuit when the first and second moveable members are respectively in a closed position; first and second thermally sensitive actuators (12a, 12b; 112a, 112b), each independently operable at an overheat temperature to move a respective one of the first and second moveable members from the closed position to an open position wherein the first and second moveable electrical contacts are separated from the fixed electrical contacts to interrupt the electrical power supply circuit; and a release member (26; 26'; 126) comprising a release part (28; 128) and a plunger (30; 130) projecting from the cordless electrical connector part; characterised in that the control assembly further comprises: a pivotally mounted latch arm (20; 20'; 120) extending laterally across the control between the first and second moveable members, the latch arm comprising a first latch (22a; 122a) for the first moveable member (16a; 116a) and a second latch (22b; 122b) for the second moveable member (16b; 116b), wherein the release member is resiliently biased to bring the release part into contact with the latch arm but the resilient bias is overcome when the plunger bears against a surface of the corresponding base connector part; wherein, when the cordless electrical connector part is mated with the corresponding base electrical connector part, and when at least one of the first and second moveable members is moved towards the open position, such movement causes the latch arm to pivot so that the respective first or second moveable member moves past the respective first or second latch before the latch arm pivots back to adopt a latching position, in which the first or second latch can prevent the respective first and second moveable member from subsequently moving from the open position back to the closed position; and wherein, when the cordless electrical connector part is separated from the corresponding base electrical connector part, the release part is resiliently biased into contact with the latch arm, thereby causing the latch arm to pivot out of the latching position such that the first and/or second moveable member is no longer prevented from moving from the open position back to the closed position.