Businesses say newly introduced post-Brexit border checks are causing disruptions, jacking up companies’ operating costs and passing on price hikes to consumers. Under the five-time delayed post-Brexit border scheme, EU food and plant imports considered “medium risk” or higher are now subject to physical checks at the Port of Dover and the Eurotunnel. A £145 import fee applies to bringing a consignment of such products into Britain and will finance the operations of the Brexit border control posts. It is the second most critical phase of the scheme that has laid out Britain’s exit from the Eur…