Changes to Regulation (EEC) No 1279/73 of the Commission of 14 May 1973 fixing accession compensatory amounts for milk and milk products during the 1973/74 dairy year: Regulation (EEC) No 659/74 of the Commission of 25 March 1974 defining a particular condition for the levying of the accession compensatory amounts in trade of the United Kingdom with the other Member States and with third countries in the market in milk and milk products