The LDS copied "Marriage records of Northern Ireland, 1922-1959" at GRONI.
Indexes are available on 6 microfilms:
Index v. 1-8 1922-1929 FHL BRITISH Film 232168
Index v. 9-16 1930-1937 FHL BRITISH Film 232169
Index v. 17-22 1938-1943 FHL BRITISH Film 232170
Index v. 23-29 1944-1950 FHL BRITISH Film 232171
Index v. 30-35 1951-1956 FHL BRITISH Film 232172
Index v. 36-38 1957-1959 FHL BRITISH Film 232173
These then point in to the 298 films of detailed entries:
1922 March quarter, v. 1-2 FHL BRITISH Film 232174
.
.
Dec. v. 334 1959 FHL BRITISH Film 232471
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The index films, and many of the detailed entry films, are held on "indefinite loan" (i.e. permanently) at major LDS centres.
[e.g. The London Family History Centre
http://www.londonfhc.org/ ]
Capt. Jock
