Two years ago, Tara Cemlyn-Jones, an investment banker who helped fund start-ups including Lastminute.com, returned to London after years abroad. She was struck by the progress in the representation of women in many fields, but also by the very low number of women business leaders. So she helped create the NGO "25x25", which has set an ambitious target: having 25 women CEOs out of the 100 largest listed companies in the United Kingdom by 2025. IMAGES AND SOUNDBITES