www.standard.co.uk/news/london/mayor-unveils-plans-for-gender-neutral-public-toilets-in-london-a3703726.html
I think he is thinking of the individual unisex cubicle type.
Great quote from a UKIP member (never thought I'd hear myself say that!!) -
David Kurten, London Assembly member for UKIP added: “The common sense solution is to have one or two unisex cubicles, which many public places already have, for everybody.
“Alongside that we also need to have separate women and men’s toilets and changing facilities. Particularly for women’s safety, we shouldn’t be opening up access to their toilets to those who are biologically male, however they identify.”