Where an enactment amends an Assembly Act or a Welsh subordinate instrument by inserting or substituting words or other material, the words or material have effect as part of that Act or instrument.

Where an Assembly Act or a Welsh subordinate instrument amends an enactment by inserting or substituting words or other material, the words or material have effect as part of that enactment.

See also section 23ZA of the Interpretation Act 1978 (c. 30) for provision about the application of that Act to retained direct EU legislation that is amended by an Assembly Act or a Welsh subordinate instrument (or by certain other legislation).