It all started in 1909, when a group of girls gatecrashed a rally of boy scouts in south London demanding that they be allowed to get involved.
A century later, and the girl guide movement now has 10 million members in 145 countries.
With the help of the Girlguiding UK archives - and the current Chief Guide Liz Burnley - see how things have developed over the past 100 years.
Photographs courtesy Girlguiding UK, Getty Images and PA. Music courtesy KPM Music. Slideshow production by Paul Kerley. Publication date 4 September 2009.
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