609 in 2015 and later

648 past in 2015 (updated 17-07-'15)

Parliament Hill Icy Swim Hootenanny (Phish), London, Great Britain

Date: 
Saturday, 17 January, 2015 - 08:30

200 swimmers will be taking part in relay races and individual 60m, 120m and 1000m events.

http://phish.org.uk