I think your copy and paste got stuck on one little bit of a sentence. Here is the rest, to help you out:
In workplaces, it is compulsory to provide sufficient single-sex toilets, as well as sufficient single-sex changing and washing facilities where these facilities are needed.
It is not compulsory for services that are open to the public to be provided on a single-sex basis or tohave single-sex facilities such as toilets. These can be single-sex if it is a proportionate means ofachieving a legitimate aim and they meet other conditions in the Act. However, it could be indirect sexdiscrimination against women if the only provision is mixed-sex.
In workplaces and services that are open to the public:
• trans women (biological men) should not be permitted to use the women’s facilities and transmen (biological women) should not be permitted to use the men’s facilities, as this will mean that they are no longer single-sex facilities and must be open to all users of the opposite sex
• in some circumstances the law also allows trans women (biological men) not to be permitted to use the men’s facilities, and trans men (biological woman) not to be permitted to use the women’s facilities
• however where facilities are available to both men and women, trans people should not be put in a position where there are no facilities for them to use
• where possible, mixed-sex toilet, washing or changing facilities in addition to sufficient single-sex facilities should be provided
• where toilet, washing or changing facilities are in lockable rooms (not cubicles) which are intended for the use of one person at a time, they can be used by either women or men