Protocol for the Accession of the Portuguese Republic and the Kingdom of Spain to the Treaty of Economic, Social, and Cultural Collaboration and Collective Self-Defence, signed at Brussels on 17 March 1948, as amended by the 'Protocol Modifying and Completing the Brussels Treaty', signed at Paris on 23 October 1954 (with Exchange of Letters between the UK and Spain concerning Article X)

Treaty Series 053/1990: Cm 1170