I wonder if Stonewall haven't been on the slide for some time. I remember working with an LGBT organisation some time ago (mid 2000s, IIRC) and they gently broached the subject of Stonewall and how they'd behaved to small LGBT organisations. Gently, because they knew what most people who wouldn't be immersed in knowledge would think, which is: Stonewall = good. I was told that Stonewall didn't listen to all sides of the civil partnership debate, and I think many LGB people felt that Stonewall had just shouted loudest, and sold them out. Not all LGB people, but certainly a lot I met at the time. They felt ignored.
I also remember going to some kind of event where they were launching - or had launched - the "some people are gay, get over it!" campaign. I went because I wasn't sure if what I was being told about them was true, and I wanted to see for myself, where I could. The atmosphere was strange and cultish (there was definitely no dissent in the room). And had a disturbing undercurrent of aggression. I remember thinking: "if you're trying to tackle homophobia, what good is shouting in ALL CAPS at people?" As in: why wasn't their approach more rational, and why didn't they show positive images of same-sex couples, rather than this angry campaign that was never going to do anything but convince homophobes they were right?
And now, fast forward to the Tavi. Why oh why haven't they been at the forefront of this, fighting for LGB youth? But maybe it's all been going wrong for some time and we just didn't know it.