Swimming outside on Christmas day in London? As ludicrous (and unappealing to many) as that might sound, it’s an annual tradition.

Every year, the hardy members of The Serpentine Swimming Club race at 9 am on Christmas morning at the south bank of the lake at Hyde Park, close to the Serpentine Café. The Peter Pan Cup is an annual event so-called because the trophy was donated by novelist J.M. Barrie in 1904 when his play Peter Pan made its London theatre debut.  A race isn’t a race without spectators, so if you’re in town and fancy a walk, you can watch from a safe (and dry) distance. Wrap up warm, and marvel at their swimmy stamina.