when did britain enter the eu
About This Site | Text Only. 1973: Britain joins the EEC The United Kingdom has become a fully-fledged member of the European Economic Community. Ireland and Denmark also joined Britain in becoming the newest members of the community, bringing the total number of member states to nine.he European Union, as it is now known, now consists of 25 member states and presidency of the organisation changes annually. Britain, Ireland and Denmark joined in 1973, Greece joined in 1981, Spain and Portugal in 1986, Austria, Finland and Sweden in 1995.