The British elections were basically too close to call late Wednesday.

On the one hand, a Labour win would bring about the U.K.’s most left-wing government in decades, but win by the incumbent Prime Minister David Cameron might bring about something else entirely.

Cameron has promised a public referendum on Britain’s membership in the European Union, a prospect that isn’t too popular with U.K. businesses.

To hear more about the implications of a “Brexit,” click the audio player above, and click here for more on what’s at stake in the U.K. Thursday.