Stansted Airport, which earlier closed after overnight snow, has underlined the scale of the task when inclement weather hits.
The airport's Twitter feed revealed it must clear 1.2 million square metres of paved surfaces and 20kms of airside roads when heavy snow falls.
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The official Brexit campaign "cheated" during the European Union referendum to get around spending limits, a whistleblower has claimed.
A cloudy and damp start for many southeastern areas, but turning brighter through the afternoon.
Countries have been switching off their lights for Earth Hour, a global call for international unity on the importance of climate change.