​It was a mild Boxing Day in Northern Ireland, albeit cooler than both Christmas Eve and Christmas Day. The temperature did not make double digits, rising to 9.8 Celsius in Castlederg. This was almost 4C lower than Christmas Eve, where it hit 13.7C in Co Down, within a whisker of NI’s warmest ever December 24 of 13.9C in 1942.

Hundreds of hardy swimmers braved the teeth-chattering temperatures of the North Sea as they took part in fundraising festive swims across Suffolk. The Christmas Day dippers, including some in fancy dress outfits,

Turkeys, knights of old and even an oven were just some of the festive fancy dress choices by those taking part in outdoor swims on Christmas Day. Plucky bathers took to the sea off Dorset, Devon and Norfolk as well as the Serpentine lake for the traditional Peter Pan Cup race in London's Hyde Park.

People gathered on Christmas morning on the Brighton seafront for the longstanding tradition, which was first started by Brighton Swimming Club in 1860

Throngs of brave souls took to the waters across Ireland for charity Christmas swims, with Dubliners facing the chilly embrace of the sea at Clontarf. The mild morning was graced by a stunning sunrise,

Brave outdoor swimmers wore Father Christmas hats as they kicked off their celebrations with a festive dip. Sea surface temperatures across the country were between 8C and 11C, the Met Office said. But plucky bathers,