After involvement in the now defunct Union of the Democratic Centre (UCD), Zaplana joined the PP.
represented the centre-right Union of the Democratic Centre; Manuel Fraga Iribarne, the centre-right People's Alliance; Gregorio Peces-Barba, the Spanish Socialist Workers' Party; Jordi Solé Tura, the Unified Socialist Party of Catalonia and Miguel Roca Junyent, of the Democratic Pact for Catalonia, represented the Catalan nationalists.
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