A thermal event detection and notification system for use in an aircraft comprising sensing means for detecting a thermal event, a control unit comprising means for receiving information from the sensing means, the information being indicative of the detected thermal event said thermal event comprising an increase in temperature, and means for determining, based on said information received, a location of said thermal event, and further comprising indication means for providing an indication of the location of the detected thermal event responsive to information received from said control unit regarding said location, wherein said indication means is configured to provide said indication of the thermal event location at said thermal event location; and wherein said sensing means is distributed within an area inside the aircraft and is configured to sense said detected thermal event at a plurality of locations within said area and wherein said indication means comprises a plurality of location indicating output means (17, 21) distributed at a plurality of locations within said area and wherein said control unit comprises means for determining which of said plurality of location indicating output means (17, 21) is or are located closest to said detected thermal event location and using said closest location indicating output means (17, 21) to provide said indication of the location of the detected thermal event; and wherein said plurality of location indicating output means (17,21) comprise a plurality of lights within the aircraft cabin, wherein said plurality of lights within the aircraft cabin comprise emergency exit floor lights, and wherein said plurality of lights within the aircraft cabin are configured, in response to said information received from said control means, to provide a first level of illumination for the light(s) located closest to said detected thermal event location, and a second level of illumination, different to the first level, for the remaining light(s) within the aircraft cabin, thereby providing a visual indication of said thermal event at said thermal event location. sensing means for detecting a thermal event, a control unit comprising means for receiving information from the sensing means, the information being indicative of the detected thermal event said thermal event comprising an increase in temperature, and means for determining, based on said information received, a location of said thermal event, and further comprising indication means for providing an indication of the location of the detected thermal event responsive to information received from said control unit regarding said location, wherein said indication means is configured to provide said indication of the thermal event location at said thermal event location; and wherein said sensing means is distributed within an area inside the aircraft and is configured to sense said detected thermal event at a plurality of locations within said area and wherein said indication means comprises a plurality of location indicating output means (17, 21) distributed at a plurality of locations within said area and wherein said control unit comprises means for determining which of said plurality of location indicating output means (17, 21) is or are located closest to said detected thermal event location and using said closest location indicating output means (17, 21) to provide said indication of the location of the detected thermal event; and wherein said plurality of location indicating output means (17,21) comprise a plurality of lights within the aircraft cabin, wherein said plurality of lights within the aircraft cabin comprise emergency exit floor lights, and wherein said plurality of lights within the aircraft cabin are configured, in response to said information received from said control means, to provide a first level of illumination for the light(s) located closest to said detected thermal event location, and a second level of illumination, different to the first level, for the remaining light(s) within the aircraft cabin, thereby providing a visual indication of said thermal event at said thermal event location.