Irish Sea (Navigational Aid) 25. Mr. Wyn Roberts asked the Minister of State for Defence whether he will give the necessary protection by the Forces to enable the red slave station of the North British Decca chain at Clanrolla in Northern Ireland to operate again after last November's explosion. Mr. G. Johnson Smith This privately-owned property provides a navigational aid which is used primarily by fishing and other commercial vessels in the Irish Sea. Its need for protection has been carefully considered and the Army has already arranged for it to be covered by irregularly-timed routine patrols operating in the area.