I don't have a problem with Eddie Izzard using a cubicle in the ladies toilets providing he sits down and leaves it clean. I somehow doubt he is a prolific sex offender or is bothered by what the other women using the facilities are doing. However, I do think the facilities should be completely contained so that there can be no means of any funny business and that women (of either sex) are safe.
What I'd like to see is that the conversation is had that women are protected from deviants and a blue print for any premises offering mixed sex toilets so that women can feel safe. Anybody using Disabled toilets will have been "sharing" their toilet for years.