Gerry Adams has told a High Court jury he was “astonished” at the “poor journalism” and “attempted hatchet job” of a BBC NI Spotlight programme alleging he had played a part in the 2006 murder of IRA informer Denis Donaldson. Aired in 2016, the former Sinn Féin president said the broadcast accused the IRA of carrying out a murder a year after decommissioning, when “Herculean efforts” had led the organisation to tell its volunteers after decades of war that the armed struggle was “done and dusted”. He said the IRA volunteers who obeyed the instructions of their leadership in 2005 were…