a hard-hitting scientology documentary slammed by john travolta is unlikely to be aired in the uk because of fears that the differences in defamation law in northern ireland mean controversial us expose hbo 's ` going clear ' might not be broadcast by sky atlantic .
the alex gibney-directed film , which alleges abusive practices at the religion 's us headquarters , was due to premiere in the uk earlier this month to coincide with its american .
but the fact that northern ireland is not subject to the 2013 defamation act means sky is set to postpone or according to the observer that