European Union Directives.
daphnedill.
You state in your post . "The EU has little practical influence and we can refuse to follow EU Directives"
A Directive is a LEGAL ACT of the European Union, which requires member states to achieve a particular result without dictating the means of achieving that result.
"Legal Basis Article 288.
To exercise the Unions competencies, the Institutions SHALL adopt regulations, directives, decisions, recommendations and opinions.
A regulation shall have general application. IT SHALL BE BINDING IN IT'S ENTIREITY and applicable to ALL Member States.
A Directive SHALL BE BINDING , as to the result achieved , upon each Member State to which it is addressed, but shall leave to the national authorities the choice of form or methods.
A Decision SHALL BE BINDING in it's ENTIREITY upon those to whom it is addressed.
Recommendations shall have no binding force."
The Council can delegate LEGISLATIVE AUTHORITY to the Commission and, depending on the area and the appropriate legislative procedure, both Institutions can SEEK TO MAKE LAWS.
The European Union has enormous influence over the UK. You are correct , we would have to apply by their regulations to trade with those 27 EU countries in the EU. We could trade with other countries outside the EU on our own terms however. Instead of both arms behind outback we could only have one. It is a very difficult call to make whether we stay In or Out but dismissing the EU as not having influence over us is simply not true.