Section 22 of the Public Health (Alcohol) Act outlines how alcohol may be displayed and advertised within a retail outlet. A retailer may have a closed storage unit at one Point of Sale area and/or one of following 3 options:
Section 22 states all alcohol must be displayed in a separate area of a retail outlet that is separated by a physical barrier which has a minimum height of not less than 1.2 metres and through which alcohol and advertisements for alcohol are not visible. Smaller retail outlets, one or more enclosed adjacent storage units on the shop floor in which the products are not visible up to a minimum height of 1.5 metres.
The HSE have prepared a guidance note on structural separation which you can access HERE.