Andrew Welch has a difficult job. As marketing director for British Naturism, he's paid to promote social nudity and attract new and younger recruits to an organisation with a membership that gets smaller and greyer every year. His brainchild for 2016 is the Great British Skinny Dip. The idea is for venues across the country to host nude swims over one weekend in September - so young people can give nakedness a go in its most accessible form. The Great British Skinny Dip follows Andrew over six busy months, including meetings with other members of this very private community. Linda is a kitchen assistant, John a former trade union officer, and Christine used to be a head teacher. All have decided to join Andrew's initiative to try and bring more people into the fold. In John's case this will involve coming out as a naturist. During the filming, after ten years of being single, Andrew gets a new girlfriend, Sheryn.