I've done the survey, talking about how my place of work has a published policy which allows people to use whichever toilet they feel "comfortable" in, and how this has an impact on my sense of safety (and cleanliness, frankly).
Sex Matters has the links & an outline of some suggested responses.
The Equality Impact Assessment focuses on the protected characteristic of "gender reassignment" and gives a very shallow bland account of the EIA for "sex."
Brava, Maya Forstater & her team!
https://sex-matters.org/take-action/respond-to-the-toilets-consultation/?mc_cid=fe7b296b16&mc_eid=311b3b5ba7