Britain is not an EU country. At 23: 00 GMT in 2020, 1, 3 1, Britain officially left the EU, ending its 47-year membership in the EU. Britain and Europe will enter a transition period lasting 1 1 month until the end of 2020. In the meantime, Britain will continue to implement EU rules and abide by EU laws, and the trade rules between the two sides will also maintain the status quo.