If working with a small group of children, just having one toilet for 3 staff and 4 young children, no access to another one. This is my current role, every other school has had separate staff toilets.
Or in a previous role, working with service users with learning difficulties and again only one toilet for everybody, service users that don't ever flush the chain (not saying it is their fault), with a broken lock on the door so service users could walk in on you at any minute.
I think both situations are not acceptable and that staff should be provided with their own toilets, am I just expecting too much though?