In 1975 we were in the EEC which was hugely different to the EU which resulted in Brexit.So what about the 1975 refendum to remain which 64% said yes. Was that not final/definitive/sacrosanct ?
The Single European Act of 1987 amended the Treaty of Rome. Its aim was to create a single internal market, which had been proving difficult under the existing Treaties. The SEA replaced many unanimous decision-making processes with Qualified Majority Voting, in order to facilitate the adoption of a raft of European Union legislation by the end of 1992.
The European Union was formed in 1993, it incorporated the EEC and renamed it the European Community. Then, in 2009, the EC's institutions were absorbed into the EU's wider framework and the EEC formally ceased to exist.
Now, tell me why the UK 1975 EEC membership referendum result should still be binding upon us after the EEC itself no longer existed and we had no say whatsoever in becoming EC / EU members?