Lawyers warn that differences in defamation law in Northern Ireland mean controversial US documentary ‘Going Clear’ might not be broadcastPlans to broadcast HBO’s Church of Scientology exposé, Going Clear, have been shelved by Sky Atlantic in a virtual repeat of events two years ago, when UK publishers abandoned publication of the book on which the hard-hitting new TV documentary is based.Sky originally indicated that the Alex Gibney-directed film, which alleges abusive practices at the religion’s US headquarters, would be transmitted in the UK earlier this month in step with its American release.