The court also relied somewhat heavily on a more specific feature of UK constitutional principles: that if Parliament has granted a right to British citizens, o

The court also relied somewhat heavily on a more specific feature of UK constitutional principles: that if Parliament has granted a right to British citizens, only Parliament itself may revoke it. The European Communities Act 1972, the court held here, has the effect of granting certain individual rights to British citizens (such as a right of appeal to various EU courts). As these were granted by an Act of Parliament, they can only be revoked by another Act of Parliament, not by a decree of the Government. Therefore the European Communities Act 1972 must be properly repealed by Parliament, not de-facto rendered inoperative by action of the Government.