Just seen this after reading your post
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Does the EU prevent the creation of freeports?
No. The UK could create freeports as a member of the EU. Indeed, the UK has previously been home to several freeports, including Liverpool, Southampton, the Port of Tilbury and Glasgow Prestwick Airport. There was a total of seven freeports between 1984 and 2012, when the UK legislation that established their use was not renewed.
There are currently 80 free zones within the EU, located across 21 member states. There are 24 in England alone. These zones vary in design and can be geared towards particular industries, like bio-sciences at Manchester Airport or advanced manufacturing in Tees Valley
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Freeports and free zones in the EU have to comply with EU rules – for example, the
EU state aid rulesdesigned to ensure fair competition. This is because tax exemptions and financial incentives offered to businesses in these zones can, in principle, be considered as a state subsidy that distorts competition.”