Hiya Tony,
Sorry for the delay in replying to your query. I sometimes wonder if I'm the only one who has a titter of wit and takes the trouble from time to time to phone the Irish and Local Studies department in the Central Library, Royal Avenue, Belfast if a query arises which cannot be answered. It only takes a few minutes and the librarians there are extremely helpful. An email would produce a similar result.
Here's the answer to your question. I checked with the Central Library in Royal Avenue on Friday 24th November. I was told they hold the Rolls from about 1946 onwards. They have one for the 1930s but it is not complete.
All the Best in your search,
Chris