Downstream

London, and Lewis hoped his
swim would draw attention to
climate change and show that
people didn’t have to travel
far to see what was happening
in their own environment. ‘It
was the toughest swim I’d
ever done,’ he says today. ‘I
was hugely unprepared. A
couple of months before I did
a recce looking at the flow
with Nic Marshall [a friend
from South Africa who was
to accompany him on his