Not if you have to track the term "sex" through the Act.
The word can mean something different in section 7 and 12
7Gender reassignment
(1)A person has the protected characteristic of gender reassignment if the person
• is proposing to undergo,
• is undergoing or
• has undergone a process (or part of a process) for the purpose of reassigning the
● person's sex
by changing physiological or other attributes of sex.
12 Sexual orientation
(1)Sexual orientation means a person's sexual orientation towards—
(a)persons of the same sex,
(b)persons of the opposite sex, or
(c)persons of either sex.
(2)In relation to the protected characteristic of sexual orientation—
(a)a reference to a person who has a particular protected characteristic is a reference to a person who is of a particular sexual orientation;
(b)a reference to persons who share a protected characteristic is a reference to persons who are of the same sexual orientation.
Sex
In relation to the protected characteristic of sex—
(a)a reference to a person who has a particular protected characteristic is a reference
● to a man or
● to a woman;
(b)a reference to persons who share a protected characteristic is a reference to persons of the same sex