1. The Member States shall bring into force the laws, regulations and administrative provisions necessary to comply with this Directive by 3 June 1998 at the latest or shall ensure by that date at the latest that management and labour have introduced the necessary measures by agreement, the Member States being required to take any necessary measure enabling them at any time to be in a position to guarantee the results imposed by this Directive. They shall forthwith inform the Commission thereof.
1a. As regards the United Kingdom of Great Britain and Northern Ireland, the date of 3 June 1998 in paragraph 1 shall be replaced by 15 December 1999.
2. The Member States may have a maximum additional period of one year, if this is necessary to take account of special difficulties or implementation by a collective agreement.
They must forthwith inform the Commission of such circumstances.
3. When Member States adopt the measures referred to in paragraph 1, they shall contain a reference t