Where a trade union proposes to transfer its engagements to another trade union and an alteration of the rules of the transferee union is necessary to give effect to provisions in the instrument of transfer, the executive of that union may by memorandum in writing alter the rules of that union so far as is necessary to give effect to those provisions.

This paragraph does not apply if the rules of the trade union expressly provide that this Article is not to apply to that union.

An alteration of the rules of a trade union under paragraph (1) shall not take effect unless or until the instrument of transfer takes effect.

The provisions of paragraph (1) have effect, where they apply, notwithstanding anything in the rules of the union.