The government's list of flags that do not require consent used to include the the European flag, but it was removed from the list following Brexit. According to the European Union website ...

Few flags the world over are as recognisable as the flag of Europe. Created in 1955, the 12 stars on a blue background are used throughout the international realm as the official standard of the EU.

Following the UK's departure from the European Union, the flag of the European Union is no longer included in the list of flags that do not require consent. Ms Bearder said she was flying the flag ...