People across the UK have braved the temperatures and gone swimming outdoors to kick off their Christmas Day celebrations.Hardy swimmers took a dip in festive hats and costumes in The Serpentine, in London's Hyde Park, early on Sunday.Meanwhile, people in Tynemouth, in the North East, wore bikinis, swimming shorts and Father Christmas hats as they entered the sea at King Edward's Bay.

People across the UK have braved the temperatures and gone swimming outdoors to kick off their Christmas Day celebrations.Hardy swimmers took a dip in festive hats and costumes in The Serpentine, in London's Hyde Park, early on Sunday.Meanwhile, people in Tynemouth, in the North East, wore bikinis, swimming shorts and Father Christmas hats as they entered the sea at King Edward's Bay.