Hi Paul,
Welcome to our community, and great question! Many people still remember the scheme that used to exist which entitled senior travelers from outside the isle to cheap or free transport. This scheme has been discontinued, and although there is some
subsidised public transport available, the rules for applying are quite strict and it is generally only available to those who reside in Ireland.
Outside of that, some public transport companies do offer
concessions for visiting travelers, such as tourist tickets, that your client may be able to use, as well as
special offers for travel around Ireland at various times of the year.
Hope this helps,
Cornelia