Any other options?

Yes, thanks.
About an hour after I wrote the post, I began to wonder if more public exposure of what the group of people are doing, [think more like PTA going rogue, rather than exposing a cannabis farm!] is the way to go with it all.

There is a huge anount of evidence, but I agree that I and others have to be careful.

Leaflets, posters. Speakers corner.

Not too sure what you mean obi

You would have to be sure of your facts , otherwise there may be a knock on the door!