I think the difference is that they are describing the race as a mass participation fun run for everyone, and they are only excluding women in the small print.
IANAL, and I would be interested to know what a lawyer thought of this, but if the event is a service, under the EA it is legal to provide a single sex service if any of the following conditions apply.
- Only people of that sex need the service.
- Providing the service jointly to both sexes would not be sufficiently effective.
Example: if women of a particular religion or belief will not use the local swimming pool at the same time as men, women-only swimming sessions could be provided as well as mainly-mixed sessions.
- The level of need for the services makes it not reasonably practicable to provide separate services for each sex.
Example: a women-only support unit for women who have experienced domestic or sexual violence can be set up, even if there is no parallel men-only unit because of insufficient demand.
- The service is provided at a hospital or other place, where users need special care, supervision or attention.
Example: single-sex wards in hospitals and nursing homes.
- The service is likely to be used by more than one person at the same time and a woman might reasonably object to the presence of a man (or vice versa).
Example: separate male and female changing rooms.
- A person might reasonably object to the service user being of the opposite sex because the service involves physical contact.
Potentially, the fun run comes under point 2? (eta, lost the number formatting when posted, but the second point)
Anyone can set up a single sex association with no need to justify the reason, but I don't think you can be said to be joining an association when you sign up for a fun run?