Changes made by Regulation (EEC) No 3900/91 suspending Common Customs Tariff duties for products covered by Regulation (EEC)…
EU Regulation No 3900/1991
No changes made by Regulation (EEC) No 3900/91 suspending Common Customs Tariff duties for products covered by Regulation (EEC)… are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.