https://fta.co.uk/media/press-releases/2018/july/positive-reception-for-brexit-white-paper-from-log
https://publiclawforeveryone.com/2017/06/10/does-the-salisbury-convention-apply-during-a-hung-parliament/
http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/