Ruth O'Reilly, editor of The Detail, forwarded me more information about tweeting from court in NI.
She said she contacted the Lord Chief Justice’s office for clarification on the position and was told:
"The approach in Northern Ireland is that journalists should make an application to the judge to request permission to use electronic devices to Twitter or send out texts from Court. It will be for the individual judge to consider the individual request taking account of the public interest in the case and the risk of interference with the administration of justice that would be attached to using live, instantaneous communications from Court.”
Editor of online investigative news and current affairs website for and about Northern Ireland - The Detail