The Green Party has an up to date political programme document on its website:
Improving Trans Rights
Trans people are subject to ingrained prejudice; at school, in work, in society and in the media. The Green Party affirms that trans men are men, trans women are women and that non-binary genders exist and are valid.
We will tackle prejudice against trans people, strengthening hate crime legislation and improving public education on the issue.
We will take practical steps to make life easier for trans people, updating the Gender Recognition Act to allow trans youth and non-binary people to get legal recognition through self-declaration.
That's what the Green Party stand for.