Your latest martyr was not jailed for singing a song, he pleaded guilt to and was sentenced to prison for Violent Disorder.
“David Spring, 61, of Sutton, pleaded guilty to violent disorder and was sentenced to 18 months’ imprisonment at Inner London Crown Court on August 13, 2024. Spring was part of a 700-strong group who wreaked havoc in Whitehall on July 31. Members of the group ignored a police cordon and moved on to assault and spit at officers who were in attendance.”
https://www.cps.gov.uk/london-north/news/crown-prosecution-service-pan-london-and-hate-crime-scrutiny-panel-joint#:~:text=David Spring%2C 61%2C of Sutton,in Whitehall on July 31.