The veteran explorer Sir Ranulph Fiennes is to set off on his coldest challenge yet today - a journey across the heart of Antarctica during the winter.
His expedition ship - the SA Agulhas - will receive a Royal send off from the Prince of Wales before it departs later today.
Over a six month period, the team will travel 2,000 miles across the ice, mostly in complete darkness and in temperatures close to -90°C.
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Another cold, frosty and foggy night for many. Northern and western areas will see thickening cloud, patchy rain and milder temperatures.
Temperatures have already plunged to -12C in some parts of the UK this winter - but Thursday could be the coldest day yet.