Downstream

about Thames swimming
since Victorian times, along
with warnings about strong
currents and tides, the depth
and the cold, pollution and
boats. ‘No swimming’ signs
remain, while the latest form
of legislation is the by-law
introduced in 2012 which
prevents swimming through
central London. But London
Mayor Boris Johnson, who
once jumped in at Chiswick –
‘it was lovely and cool . . .