Gender reassignment is a protected characteristic under the Equality Act 2010. This means that transgender men and women are protected against discrimination at work.
Gender reassignment is defined as someone who is proposing to undergo, is undergoing or has undergone a process (or part of a process) for the purpose of reassigning his or her sex by changing physiological or other attributes of sex. It is not necessary for the individual to be under medical supervision or undergoing surgery.
The definition covers a woman who has decided to live permanently as a man, but has not and will not undergo any surgical or medical procedures or treatments.