Sinn Féin could bring down Brexit without even taking their seats. http://www.theneweuropean.co.uk/top-stories/how-sinn-fein-could-bring-down-brexit-but-it-doesn-t-involve-taking-their-seats-1-6198722
How Sinn Féin could bring down Brexit - but it doesn’t involve taking their seats https://www.theneweuropean.co.uk/top-stories/how-sinn-fein-could-bring-down-brexit-but-it-doesn-t-involve-taking-their-seats-1-6198722