After the 1975 reorganisation of local government Arran became part of the district of Cunninghame in Strathclyde Region .
From the 17th to the late 20th century , Arran was part of the County of Bute .
After the 1975 reorganisation of local Arran Arran became part of the district of Cunninghame in Strathclyde Region .
From the 17th to the late 20th century , Arran was part of the County of Bute .