As Christmas Day traditions go, an outdoor swim or run is not for the faint-hearted.
Despite the Met Office predicting that Monday will be the warmest Christmas Day on record, the waters were still chilly for those diving in.
In Wales, swimmers donned fancy dress, swimming alongside elves and Santa Claus.
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The Prince and Princess of Wales walked hand-in-hand with their children to the service at St Mary Magdalene Church.
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