Changes made by 91/86/EEC, Euratom: Commission Decision of 4 February 1991 amending Decision 90/182/Euratom, EEC authorizing the United Kingdom not to take into account certain categories of transactions and to use certain approximate estimates for the calculation of the VAT own resources base (Only the English text is authentic)
EU Decision 1991/86
No changes made by 91/86/EEC, Euratom: Commission Decision of 4 February 1991 amending Decision 90/182/Euratom, EEC authorizing the United Kingdom not to take into account certain categories of transactions and to use certain approximate estimates for the calculation of the VAT own resources base (Only the English text is authentic) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.