http://www.legislation.gov.uk/id/ukpga/2017/4/part/1

Part 1Constitutional arrangements

Permanence of the National Assembly for Wales and Welsh Government

1Permanence of the National Assembly for Wales and Welsh Government

In the Government of Wales Act 2006, before Part 1 (National Assembly for Wales) insert—

Part A1Permanence of the Assembly and Welsh Government
A1Permanence of the Assembly and Welsh Government
1
The Assembly established by Part 1 and the Welsh Government established by Part 2 are a permanent part of the United Kingdom's constitutional arrangements.
2
The purpose of this section is, with due regard to the other provisions of this Act, to signify the commitment of the Parliament and Government of the United Kingdom to the Assembly and the Welsh Government.
3
In view of that commitment it is declared that the Assembly and the Welsh Government are not to be abolished except on the basis of a decision of the people of Wales voting in a referendum.
A2Recognition of Welsh law
1
The law that applies in Wales includes a body of Welsh law made by the Assembly and the Welsh Ministers.
2
The purpose of this section is, with due regard to the other provisions of this Act, to recognise the ability of the Assembly and the Welsh Ministers to make law forming part of the law of England and Wales.