Article 19(2) and (3) of Directive 73/239/EEC shall be replaced by the following:
'2. Member States shall require insurance undertakings with head offices within their territories to render periodically the returns, together with statistical documents, which are necessary for the purposes of supervision. The competent authorities shall provide each other with any documents and information that are useful for the purposes of supervision.
3. Every Member State shall take all steps necessary to ensure that the competent authorities have the powers and means necessary for the supervision of the business of insurance undertakings with head offices within their territories, including business carried on outwith those territories, in accordance with the Council Directives governing such business and for the purpose of seeing that they are implemented.
These powers and means must, in particular, enable the competent authorities to:
(a) make detailed enquiries regarding an undertaking's si