Let him speak. He will make an idiot of himself and be ripped to shreds in the process.
Hasn't he disassociated himself with the EDL, now? There was all the stuff with him working with the Quilliam Foundation, and all that.
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I've seen a lot of times where he gets shouted down by leftie rent a mobs, but afaik he's never actually said anything that controversial?. His far right reputation is pretty much a fiction from what I've read. Not what I was expecting at all.
"I disapprove of what you say, but I will defend to the death your right to say it"
He's free to be a racist ******* and I'm free to kick his head in because of it.
He can say what he likes, I can react how I like. That is how this works.
There was one time, on question time I think where he was being very tame and didn't really say anything very controversial but where a woman in the audience was just constantly shouting over him calling him a racist.

He's free to be a racist ******* and I'm free to kick his head in because of it.
He can say what he likes, I can react how I like. That is how this works.
Let him speak. Then mock/debate with him. His weak arguments will be quickly exposed.
In a democracy we should convince through argument, not censorship.
Freedom of speech does not mean freedom from consequences and it does not mean a right to enforce your opinion on others or require others to listen your bile.
No one is forcing anyone to listen to it...
Hes not being entitled to speak, he is being invited. The choice of listening to him now lies with the attendees. It is far better to simply walk out when he starts talking than it is to try to organise a boycott.