Almost €22m of taxpayers’ money will be spent by the end of the year on just six of the 15 investigations and tribunals that have been announced by Government.

Publication of the final report of the inquiry into the shooting dead of a Real IRA member by gardaí during an attempted robbery is being delayed by a High Court challenge from a person named in the document.

The cost of an inquiry into the fatal shooting of a Real IRA member by gardaí is running at more than double the original estimate.