Photographer: Chris Ratcliffe/Bloomberg

Hidden Millions Fund the Debate Over Britain's European Future

  • Electoral Commission names official lead campaigners in April
  • Cash raised before Feb. 1 doesn't have to be disclosed

In the battle to win over U.K. voters ahead of June’s referendum on the European Union, the rival "in" and "out" campaigns have been tapping up businesses and wealthy individuals for cash. Just how much, may never be known.

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