欧州中央銀行制度
As a member of the European Union, the United Kingdom could have adopted the euro as its currency. However, the subject was always politically controversial, and the UK negotiated an opt-out on this issue. Following the UK's withdrawal from the EU, on 31 January 2020, the Bank of England ended its membership of the European System of Central Banks, and shares in the European Central Bank were reallocated to other EU banks.