Sorry I replied to your post before you had a chance to edit it. Never mind.
No problem, the reply was informative.
I was always a bit confused because I knew East Belfast was where the shipyard workers lived and these were traditionally Prods, in the days before the ''troubles.'' There must have been an enclave of Catholics there though, because I am fairly sure that there was a disgusting amount of house-burnings there in the 60's and 70's.