CCOB was certainly from Republican aristocracy as his family on both sides were actively involved in the National Cause. He also worked as a young diplomat for the Irish government's anti-partition campaign in the 50s under Dev.Didn't CCB come from a staunch Republican background and then swung the other way as he got older. By the time he karked it he was almost a paid up member of the Orange Lodge.
He joined Labour and was very prominent in Irish leftist circles in the 60s and recognised from a very early stage the danger of the Provos and was to the forefront in actions against them, initiating Section 31. The Provos absolutely hated him beyond any Unionist politician in the North. In later years he joined Bob McCartney's Unionist party.
Speaking of the Orange in 1971 he was in Derry to watch the Apprentice Boys and was wandering around the field at St Columb's Park went he was identified as a southern Fenian and beaten up.
You can always rely on the Prods to shoot themselves in the foot when it comes to promotion and propaganda.