Do Security Guards have to wear ID ?

From : http://www.irishstatutebook.ie/2004/en/act/pub/0012/sec0030.html

"30.—(1) An individual who is a member of a prescribed category of licensees shall, when providing a security service, wear an identity badge. "

What exactly is this prescribed category ? Heuston Station is full of bruisers who look like they were released from a Serbian prison and they are wearing STT Rail Security uniforms but have no ID badges. The majority of bouncers don't seem to have actual ID (though some have "numbers" ?

What are their responsibilities ? What are our rights when confronted by rent-a-cops ?

Our rights seem to be hard to find