The previous recorded high in Sydney was in January 1939, when the thermometer topped 45.3C at Observatory Hill.

BBC: Sydney bakes on hottest day on record as bushfires rage

Hannah Windsor, 17, was found dead near the observatory on Bidston Hill, Wirral, on Saturday night.

BBC: Scene at Bidston Observatory

Her body was found in undergrowth next to the Bidston Hill Observatory.

BBC: Hannah Windsor murder: Report cites care system failings