Silicon Valley Brits: 'We had to leave the UK behind'

Wearing a lightly-coloured checked shirt, shorts, and with a soft English accent, Cal Henderson delivers a harsh truth. “It probably would have been impossible to start Slack in the UK.” Slack, a workplace communications tool valued earlier this year at $3.8bn, is unquestionably one of San Francisco’s hottest start-ups. And, as well as Henderson, the company is peppered with British technology talent. “Because of the way we built the company, and the money that starting the kind of company like Slack requires, it’s just not possible anywhere outside of the Valley.”

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