Letter from Chief Secretary's Office, Dublin Castle to Home Office London, 6th June 1918 (edited version).
Sir, With reference to the application from Messrs. Corrigan & Corrigan, Solicitors, to visit Mr. W.T.Cosgrave, M.P., at present interned in Reading Prison, I am directed by the Lord Lieutenant, Viscount French, to request you to inform the Secretary of State that there are some Solicitors who could not be trusted to refrain from carrying messages to and from interned prisoners, and that such messages might be dangerous to the State. His Excellency desires me to say that he thinks it might be advisable to lay down that interned prisoners, who desire to see Solicitors about their affairs, may be permitted to have interviews in sight but not in hearing of a warder with Solicitors who will give an undertaking and who are likely to keep it. Signed W.P.Byrne.
The German Plot was a conspiracy alleged in May 1918 by Dublin Castle administration in Ireland and by the mercurial Lord French, the new Lord Lieutenant, to exist between Sinn Fein and Germany to start another armed insurrection during World War 1.