To: PRIDE in London:
I'm following this issue from Hong Kong and find your position not valid.
You really ought to support Muslim and ex-Muslims LGBTs. If they say that certain mosques in London are homophobic, it's because they are (and murderously so). If they say that Islam hates gays, it's because it does. (and here . Read up on Islam, if you don't believe me).
Anti LGBT views need to be called out and faced everywhere, not just in our comfortable secular christian society (where "Jesus is gay" posters go unremarked).
You can have your Pride, by all means. But how about your Spine?
Show it, by announcing that they will be welcome at the next Pride march, and saying so, right now.