Anecdotal but a mate of mine was viciously attacked in the street in 2019 in an unprovoked attack. Fractured cheek bone, broken nose bad concussion amongst various other injuries and 2 weeks in hospital. Aside from the fact that it only got to court early this year the guy who was very well known to the police, has a history of violence including previous custodial sentences got a fine and community service, most likely because the prisons are full according to his solicitor. It was a serious attack that could have been much worse only 3 bystanders intervened, the guy was jumping on his head while he was already unconscious lying on the ground.
4 and 5 years for protesting seems out of kilter to me when you consider who isn’t being locked up and what they did. Punish them for sure but at least make that punishment fit especially when considering it to other far far more serious crimes.