The EHRC guidance does not apply to workplaces, and trans people are not criminalised for using any toilet in the UK. But the whole point of this - as with Section 28 back in the 1980s - is to intimidate people. Don't give into that fear.
Just a reminder that: - this isn't for workplaces and if your work is trying to implement it scare them over discrimination claims - the onus is on the service provider, not the service user to comply - the code *itself* says enforcement of toilet facilities is unworkable and low priority