https://www.niauk.org/media-centre/blog/uk-explore-retaining-membership-euratom/
http://www.conservativehome.com/platform/2017/05/what-would-wto-mean-andrew-stoler-and-geoff-raby-brexit-britain-has-no-need-to-fear-wto-terms.html
http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/