I will try and get the lyrics. I often play with a trio called "The Diggers" and it's a song we sometimes do, though I am not the lead singer in it.
It is a rocking song. And indeed the call "Oo ah, up the RA! Oo ah up the RA!, does refer to the IRA.
The Wolfe Tones make particular mention of this during their concerts when some people were singing "Oo ah, up their ass"
Many of the lyrics are good. I especially like the take on the lion sleeping in the jungle deep, since it I believe it refers to the old African liberation song, "Wimoweh".
Rather mystical tune all in all.
I would get the lyrics posted ASAP.
Len Wallace