Brixton Hatter
Home is south London mate
Monday to Friday it's open til 10pm, so later in the evening is often quiet. Also 2pm-4pm-ish after the classes have finished and before people start coming for an after-work swim.When is the Rec pool at its quietest?
More details here on when the classes etc are on: http://www.better.org.uk/leisure/brixton-recreation-centre
…though to be fair the classes often only take up one or maybe two lanes.