I'm all for single sex spaces however I've read online that this space is open to lesbian friends and 'allies' (men or women).
I don't know if 100% of their lesbian clientele would agree but it seems difficult to enforce unless they make it lesbian-only or even women-only. A 'progressive' festival like Glastonbury isn't going to risk excluding NB, trans etc due to negative publicity unfortunately.
It's a shame women can't have anything of their own. I feel like in the Green Fields of old it would be lesbians only (of the biological woman variety 🙄) and no nonsense would be tolerated. I think this venue is in The Park (a popular, busy area) and it's inclusive of course.
I take slight pause in that heterosexual women have been going to gay bars and clubs for decades, either with their gay friends or as a safer venue to avoid the attention of heterosexual men. I'm not sure men need to be in a lesbian venue for the same reasons. If you're a man enjoying the festival with a lesbian friend I guess it would be crap to have to separate and not enjoy a drink and a sit down together. On the other hand as an adult you might think 'is my presence welcome?' and go to literally any other venue instead. Then again the lesbian misses out unless they want to go in alone (always an option), festivals are generally.
I imagine there's a fair few straight women in there as well as various letters of the alphabet that aren't L.