I am posting this because my understanding is that some employers have simply put a Gender Neutral/Unisex sign where there is a room of cubicles and shared washing hand basin space.
Please refer your employer to Section 20 of The Workplace (Health, Safety and Welfare) Regulations 1992 which states that sanitary conveniences shall not be suitable unless separate rooms are provided for men and women or each convenience is in a separate room the door of which is capable of being secured from inside. Note it is room and not cubicle. The same Regulations state that washing facilities must be provided in the immediate vicinity of every sanitary convenience and are not suitable unless they are in single sex rooms.
Apologies for more toilet chat, it's just some information which some people may find helpful ( and which you may already know). Where I work they want to make some facilities unisex. They can't use the Male loos because of the urinals, so guess who will get the reduction in the provision of toilets?