Changes to Council Directive of 16 December 1991 on the reciprocal recognition of national boatmasters' certificates for the carriage of goods and passengers by inland waterway (91/672/EEC)
EU Directive 1991/672
Made by Council Directive 2006/103/EC of 20 November 2006 adapting certain Directives in the field of transport policy, by reason of the accession of Bulgaria and Romania
From legislation.gov.uk's record of changes, the official one: see it there.