Changes made by Council Directive 75/35/EEC of 17 December 1974 extending the scope of Directive No 64/221/EEC on the coordination of special measures concerning the movement and residence of foreign nationals which are justified on grounds of public policy, public security or public health to include nationals of a Member State who exercise the right to remain in the territory of another Member State after having pursued therein an activity in a self-employed capacity
EU Directive 1975/35
No changes made by Council Directive 75/35/EEC of 17 December 1974 extending the scope of Directive No 64/221/EEC on the coordination of special measures concerning the movement and residence of foreign nationals which are justified on grounds of public policy, public security or public health to include nationals of a Member State who exercise the right to remain in the territory of another Member State after having pursued therein an activity in a self-employed capacity are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.