Changes to Regulation (EEC) No 3339/75 of the Commission of 22 December 1975 establishing interim protective measures with regard to imports into the United Kingdom of cotton yarn and of certain fabrics originating in Spain and Portugal: Commission Regulation (EEC) No 1473/76 of 22 June 1976 extending the period of validity of interim protective measures with regard to imports into the United Kingdom of cotton yarn originating in Spain