A lighting control for selectively supplying an AC input voltage to an external lighting load (8, 10), said lighting control comprising: a controllable switching element (34, 36) arranged between a mains live input terminal and a mains live output terminal (22, 24), said controllable switching element (34, 36) arranged to operate in an on state in which a connection path between the mains live input terminal and the mains live output terminal (22, 24) is enabled, and an off state in which the connection path is disabled; a switch mode power supply connected between the mains live input terminal and a mains earth terminal, said switch mode power supply being arranged to selectively pass a leakage current between the mains live input terminal and the mains earth terminal to generate a DC output voltage; and a wireless controller arranged to operate the controllable switching element (34, 36) in response to a received control signal, wherein the DC output voltage generated by the switch mode power supply is supplied to the wireless controller; wherein the lighting control is characterised by: a current monitor arranged to measure the leakage current and to generate a feedback signal having a first value when the leakage current is below a predetermined threshold value and a second value when the leakage current is not below the predetermined threshold value, said current monitor being arranged to supply said feedback signal to a feedback input of the switch mode power supply; wherein the switch mode power supply is arranged to enable the leakage current between the mains live input terminal and the mains earth terminal when the feedback signal has its first value, and to disable the leakage current between the mains live input terminal and the mains earth terminal when the feedback signal has its second value. a controllable switching element (34, 36) arranged between a mains live input terminal and a mains live output terminal (22, 24), said controllable switching element (34, 36) arranged to operate in an on state in which a connection path between the mains live input terminal and the mains live output terminal (22, 24) is enabled, and an off state in which the connection path is disabled; a switch mode power supply connected between the mains live input terminal and a mains earth terminal, said switch mode power supply being arranged to selectively pass a leakage current between the mains live input terminal and the mains earth terminal to generate a DC output voltage; and a wireless controller arranged to operate the controllable switching element (34, 36) in response to a received control signal, wherein the DC output voltage generated by the switch mode power supply is supplied to the wireless controller; wherein the lighting control is characterised by: a current monitor arranged to measure the leakage current and to generate a feedback signal having a first value when the leakage current is below a predetermined threshold value and a second value when the leakage current is not below the predetermined threshold value, said current monitor being arranged to supply said feedback signal to a feedback input of the switch mode power supply; wherein the switch mode power supply is arranged to enable the leakage current between the mains live input terminal and the mains earth terminal when the feedback signal has its first value, and to disable the leakage current between the mains live input terminal and the mains earth terminal when the feedback signal has its second value. a current monitor arranged to measure the leakage current and to generate a feedback signal having a first value when the leakage current is below a predetermined threshold value and a second value when the leakage current is not below the predetermined threshold value, said current monitor being arranged to supply said feedback signal to a feedback input of the switch mode power supply; wherein the switch mode power supply is arranged to enable the leakage current between the mains live input terminal and the mains earth terminal when the feedback signal has its first value, and to disable the leakage current between the mains live input terminal and the mains earth terminal when the feedback signal has its second value.