ENGLAND, United Kingdom (Reuters) — For 70 years, Tim Chambers’ family has harvested fruit in south-east England, but after Britain’s vote last year to leave the European Union he expanded into Poland and is ready to sell some of his land if a shortage of migrant workers worsens. His firm, W. B. Chambers & Son, has relied heavily on seasonal staff from eastern Europe for the past two decades as it focused on growing raspberries […]