A control apparatus for hydraulic machinery of the type comprising a main hydraulic control block, a hydraulic fluid holding tank and a cab control system having a plurality of controls for activating functions of the hydraulic machinery, the apparatus comprising: a remote control unit comprising a plurality of activation means in which each activation means is operable when activated to control a function of the hydraulic machinery corresponding to a control of the cab control system, a valve arrangement for each activation means, each valve arrangement comprising a first valve means in fluid communication with a second valve means; a controller means operable in response to signals received from an activation means of the remote control unit to control the opening and closing of the first valve means of the associated valve arrangement to regulate the flow of hydraulic fluid from the first valve means to the second valve means for that valve arrangement; characterised in that, the second valve means in each valve arrangement is moved between first and second configurations, in which in the first configuration the associated first valve means is open to permit the flow of hydraulic fluid through the first valve means to the second valve means and the second valve means is operable to channel the hydraulic fluid received from the first valve means to the main hydraulic control block to control the function of the hydraulic machinery corresponding to the activated activation means of the remote control unit, and in the second configuration the associated first valve means is closed preventing the flow of hydraulic fluid through the first valve means to the second valve means such that the second valve means is operable to instead channel hydraulic fluid from the cab control system to the main hydraulic control block to control the function of the hydraulic machinery corresponding to the activated control of the cab control system. a remote control unit comprising a plurality of activation means in which each activation means is operable when activated to control a function of the hydraulic machinery corresponding to a control of the cab control system, a valve arrangement for each activation means, each valve arrangement comprising a first valve means in fluid communication with a second valve means; a controller means operable in response to signals received from an activation means of the remote control unit to control the opening and closing of the first valve means of the associated valve arrangement to regulate the flow of hydraulic fluid from the first valve means to the second valve means for that valve arrangement; characterised in that, the second valve means in each valve arrangement is moved between first and second configurations, in which in the first configuration the associated first valve means is open to permit the flow of hydraulic fluid through the first valve means to the second valve means and the second valve means is operable to channel the hydraulic fluid received from the first valve means to the main hydraulic control block to control the function of the hydraulic machinery corresponding to the activated activation means of the remote control unit, and in the second configuration the associated first valve means is closed preventing the flow of hydraulic fluid through the first valve means to the second valve means such that the second valve means is operable to instead channel hydraulic fluid from the cab control system to the main hydraulic control block to control the function of the hydraulic machinery corresponding to the activated control of the cab control system.