Your problem in trying to convince people of your position is that people can read, and so far nothing you have linked or posted suggests that people have been imprisoned for chanting. And that’s because, on its own, it’s not an offence that is punished by imprisonment.
You might be able to read but your comprehension isn't too clever because I've told you about 5 times now that chanting can be and is punished in this country under the crime of violent disorder, which is an imprisonable offence. Here's another link for you to read and hopefully comprehend (took me 5 seconds to find on Google):
Tamworth disorder: Woman jailed after chanting racial slurs
Aimee Hodgkinson-Hedgecox, 37, is sentenced for her role in the unrest at the Holiday Inn Express.
www.bbc.com
Note the judge saying she accepts the defendant was not involved in violence. Is that clear enough for you now?