In July, a leading British book publisher warned of the 'chilling effect' the law would have on journalism, after a judge rejected its defence of qualified privilege in a libel action brought by a former police officer.

BBC: NEWS | UK | Landmark decision for 'free speech'

Mr Gormley's claim is being resisted on the grounds of fair comment, qualified privilege and a further defence of justification.

BBC: Sinn Fein legal bid to stop libel action by Declan Gormley