British cops yank a guy's firearms license because

'People on your YouTube channel say unapproved things, making it a Forum of Extremism'. But they have no problem with a bunch of actual terrorism supporters marching.

They do, however have a big problem with a guy in a wheelchair blocking the terrorism-support march.
“These people were supporting terrorists. We had to object and not give them a free pass. These are our streets. The Government were allowing them a free rein, we had to stop them. I thought I’d challenge the Police to see if they had a legal basis to stop me exercising my freedom to protest. They said they had an order blocking the street. I asked to see it. They looked flummoxed.”
Of course they did, one of the commoners actually demanded proof of their authority to do something.

Much like the 'cops' in Berkeley, the Brit cops have been letting the protected species do just about whatever it wants; wonder if they're ready for the reaction they're helping cause?
The response can only be direct action. This action must be based on the most fundamental moral principle: reciprocity. That which you do to me, I will do to you. We will not attack you, but we will resist you. If our speakers are shouted down, yours will be shouted down as well. If you hold a protest on Holocaust Memorial Day, we will hold one on your sacred occasions. If you host antisemitic speakers, we will block the doors with our own bodies. If tuition fees pay for antisemitic groups, Jewish students will refuse to pay them. If you disrupt our events we will eject you, by force if necessary. If you boycott us, we will see to it that you are boycotted. If you hold an Israeli Apartheid Week, we will hold a Palestinian Terrorism Week. If your mob attempts to vandalize our institutions and neighborhoods, we will raise our own mob to stop you. We will hit back if we are hit. Reciprocity, after all, is accepted as a legitimate principle for all other peoples. It only becomes worrisome, problematic, unprincipled when the Jews are involved.
Of course, this is something Berkeley and some other places would be worried about if they had brains.  Because if you let one group attack and threaten another and refuse to do anything, well, there's just likely to be an equal and opposite reaction.