I’m swimming the 4K Lock to lock this Sunday on the Thames from Eynsham lock to Kings lock. With the rain we’ve had the Thames should be faster flowing (and the swim is downstream)! :) On the downside the water temperature is only 14 degrees :( 
I am seeking to raise money for this fine body of men - A Band of Brothers, Oxford, who do essential work mentoring young men in my community involved in the criminal justice system. Please see http://abandofbrothers.org.uk/ for more info. Thanks for your interest. Sam