I have a library copy of The Greening of Dublin Castle by Lawrence W McBride. Published in 1991, it is a study of ‘the transformation of bureaucratic and judicial personnel in Ireland 1892-1922.’
In 1892, the administration of Ireland was dominated by Protestants and Unionists. Thirty years later, in 1922, the administration was largely controlled by Nationalists and Catholics. The British were preparing to withdraw.
In 1922, the Provisional Government ministers, had no experience of civil administration. The one exception was W T Cosgrave, the Minister for Local Government, who had been a Sinn Fein member of Dublin County Council.