British consultants will take part in planning airport and rail infrastructure at the facility, called the Solidarity Transport Hub Poland.
The airport, between the capital, Warsaw, and the central city of Łódź, is to be a major regional transfer hub, integrating air, rail and road transport.
The memorandum of understanding was signed by Polish Deputy Infrastructure Minister Marcin Horała and Britain’s ambassador to Poland, Jonathan Knott.
Britain has pledged to share experience it gained in major projects around the world, including during work on airports in Seoul, Singapore, Beijing and Istanbul.
The first plane is expected to take off from the new airport at the end of 2027.
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