The Attorney General has vetoed the release of Cabinet committee papers relating to devolution under the Freedom of Information Act.
Dominic Grieve said in a written statement to Parliament it was not in the public interest to release the papers because it would undermine the operation of Government.
A request had been made for publication of the minutes of the Cabinet Ministerial Committee of Devolution to Scotland and Wales and the English Regions, dating from 1997 and 1998.
Such a veto has only been used twice in the past, once relating to further devolution papers and once over a request for Cabinet minutes relating to Iraq.