Tooting Bec Lido in South London Swimming Club hosts the 5th UK Cold Water Swimming Championships today.
With water temperatures as low as 1°C, jumping in for the 30 yard races is a challenge in itself.
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A huge signal failure this morning meant the Piccadilly and District lines were completely suspended.
Four more arrests have been made in a investigation after 41-year-old Brenton Roper was brutally stabbed and shot dead in east London.
Bins were set on fire and objects were thrown at officers as protesters demanded justice for the death of Edir Frederico Da Costa.