(1) In this Act -

"devolved authority" means -(a) the Scottish Ministers,(b) the Welsh Ministers, or(c) a Northern Ireland department;

"EEA EFTA separation agreement" means (as modified from time to time in accordance with any provision of it) the Agreement on arrangements between Iceland, the Principality of Liechtenstein, the Kingdom of Norway and the United Kingdom of Great Britain and Northern Ireland following the withdrawal of the United Kingdom from the European Union, the EEA Agreement and other agreements applicable between the United Kingdom and the EEA EFTA States by virtue of the United Kingdom’s membership of the European Union;