In 1909, 11,000 Boy Scouts gathered at Crystal Palace for Britain’s first jamboree. And among them, illicitly, was a small group of girls. Barred from membership because of their sex, they rustled up some makeshift uniforms and smuggled themselves in with the crowd.

“We were laughed at, we were whistled at, there were catcalls, but we didn’t mind,” remembered one of the girls, seven decades later. “We were there and we were part of the show.” Baden-Powell was outraged when he spotted them – but after talking, he left them with a promise to think about incorporating girls into the Scouting movement.