My granddad and grandma moved from Ireland to England just before WWI.
Granddad was a Scottish Presbyterian serving in the British army who was stationed in the Ashbourne area north of Dublin. He married a catholic and had 11 children. They were not comfortable with their treatment and the events that eventually led to the Irish Free State. Civil war was looming so they and nine of the children left and came to Leeds.
At the time of the Irish War of Independence and later the creation of the Irish Free State (1919-1924) the Northern Irish solution seemed the only one available. 20-20 hindsight shows otherwise. Two sides to every coin.