Thanks, I just gone back and tried "Ulster Defence League" as a phrase search on Goolge and achieved 5 hits none of which help me much. There are 17 more using "defense".Using the same technique, "Ulster Freedom Fighters" gets me 2850 hits, "Ulster Defence Association" - 3520, "Ulster Volunteer Force" - 4050, "Loyalist Volunteer Force" - 3270 hits. Assuming those 5 hits are right in using "UDL" and that the Google search could be used to indicate how well the various groups are, UDL would seem to me a strange choice for Stan Rogers.
Jon