Article from The Guardian:

Boris Johnson is considering establishing free ports in the UK if he succeeds Theresa May as UK prime minister in July. Belfast, Teesside and Aberdeen are among potential sites for the tax-free economic zones.

What is a free port?

Free ports or zones are designated by the government as areas with little to no tax in order to encourage economic activity. While located geographically within a country, they essentially exist outside its borders for tax purposes.

Companies operating within free ports can benefit from deferring the payment of taxes until their products are moved elsewhere, or can avoid them altogether if they bring in goods to store or manufacture on site before exporting them again.

Read the full article here:

What is a free port? All you need to know about the free-trade zones | Tax and spending | The Guardian