Article 21Benefits to be Excluded
For the purpose of applying Article 18 no account shall be taken of the following benefits payable under the legislation of the United Kingdom:
(a)any additional pension payable;
(b)any graduated retirement benefit payable by virtue of any graduated contributions paid before 6 April 1975;
(c)any invalidity allowance payable;
but any such benefit shall be added to the amount of any benefit payable under that legislation in accordance with paragraph (2) of Article 18.