Are there any actual revolutionary organizations in England/UK?

I don't want to be affiliated with my uni's IMT/Socialist Appeal club because I've heard they can be revisionist, and most, if not all of the UK "socialist" parties are v. transphobic. I also don't know what I can do/will be allowed to do as an international student, but just wanted to ask if there are any places where organizing will be possible. Thanku!