I was last there in April and like rwoman I don't remember showers... but the restroom area has like six (IIRC) stalls/cubicles and I guess it is possible that one was a shower and I just didn't notice it -- I've only been in the lounge in the early AM and more interested in caffeine

The phone number on the Diners Club link is a UK number -- to me that makes all of the information suspect. There is an Irish number on the other site -- give it a call (and report back )