That's a tenuous argument lamb. By extension then, the Scot's and Welsh should also use it, whether that be before or after their own distinct anthems - I'm not sure. :rolleyes:
To continue this tenuous vein - the IRFU does not cover the UK.
For the record, if the IRFU decided not to play the Irish national anthem, I wouldn't have huge problem with that.
(well - maybe just a niggle) ;)