She said the case "concerns interference with the right to freedom of expression which is a matter of such fundamental importance that it merits consideration by the appellant court".

BBC: Margaret Thatcher art posters banned from Tube

"The issue for the court was whether it should be inferred that there was a common enterprise to which the appellant agreed prior to the attack to carry out a shooting attack with intent to kill, " Sir Declan pointed out.

BBC: Northern Ireland