You've seen the poster: a skinny woman in a teeny-weeny yellow bikini glaring provocatively down at passersby. "ARE YOU BEACH BODY READY?" she challenges.
One of these shots, featuring Fiona Longmuir and Tara Costello – who'd met the day before on Twitter – went viral. It gave them an idea: an impromptu beach party in Hyde Park on Saturday 2 May, where everyone would strip to their bikinis and prove they weren't afraid to be different.