I think it's a bit of a stretch to describe the document in question as a counter terror watch list. It's a list of groups that have gathered or protested in the UK in recent years. It includes visiting international football fan supporter groups for example.
I think it's intended to be a guide for officers to help identify who is protesting and how they normally conduct themselves.
Edit: was not for police use, was distributed to teachers to help identify logos and memberships. It's clearly a misguided document but a counter terrorist watch list it is not.