Dan Wagner and the fall of 'unicorn' startup Powa Technologies

Company praised by David Cameron went into administration in February, providing a lesson in how not to manage potential

The technology entrepreneur Dan Wagner, once one of the highest-profile entrepreneurs of the dotcom era, appeared on television on Monday discussing the future of the high street and why it is struggling to survive. Speaking on Sky News, he said: "There needs to be more of an engagement to drive people out of their homes and into those stores, and make that more compelling."

Wagner did not mention the recent demise of his own retail-linked venture, a business he had hoped would encourage this "engagement", but instead collapsed into administration in February, having burned through 147m since 2013.