Re: Lord Sumption's comment
An organisation has to justify holding a single sex event. As gender isn't defined, and the PC of GR includes people proposing to undergo gender reassignment, how would it be possible to complete any assessment that include women, people who are covered by GR and exclude men not protected by GR?
The orginal assessment would need to based on sex, so why then ignore sex and include some men?
Would that be possible for any other protected characteristic - all women and religious men but excluding men who are atheists?
Edit: i suppose events can be for women and children, so include boys but exclude adult men?