Abstract: There is provided an apparatus comprising a roof panel (20) and control system (14), the roof panel comprising one or more cover portions that are moveable between open and closed positions for opening and closing the roof panel. The control system comprises an actuator (40) for moving the cover portions between the open and closed positions, a mains power supply input, and an emergency power store. The control system is configured to receive one or more signals indicative of an emergency, to power the actuator from the mains power supply when the signals indicate there is no emergency, and to power the actuator from the emergency power store when the signals indicate there is an emergency.