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Join Zoe Kleinman on a journey back in time to the world's first technology hub. Bletchley Park was home to 10,000 code breakers during World War Two - 7,000 of whom were women. What lessons can today's Silicon cities learn from the past?

She also meets the women of 21st Century Silicon Valley who are determined to make their mark without falling into the traps of stereotypes. And, she heads to Cambridge in the east of England, where the ivory towers of the ancient university are dwarfed by the exponential growth of billion dollar technology and biotechnology businesses. Great news for investors but soaring property prices are beginning to bite for the locals who live and work outside of the technology sphere.

(Photo: Bletchley Park coding cogs used on the Bombe machine developed by Alan Turing)