Change in regulations for entry to Great Britain. From October 1, 2021, entry to the UK will only be possible with a valid passport.
At the same time, people who have settled or pre-settled status under the EU Settlement Scheme will be able to use their ID cards to enter the UK at least until December 31, 2025.
After October 1, 2021, it will be possible to leave the UK to Poland on the basis of an ID card, provided that the airline or another carrier accepts this type of identity document as a travel document.
For more info visit https://www.gov.uk/visit-eu-switzerland-norway-iceland-liechtenstein