Acme Whistles CEO: Brexit vote is an 'own goal'
So how are businesses being affected by Brexit?
The Acme Whistles factory in Birmingham makes six million whistles a year and sells more than half of them to EU countries.
It even makes the official referees' whistle for European Football Championships.
Chief executive, Simon Topman, says that for him, the vote leave is an "own goal" against the British manufacturing industry.