Great stuff, highame. There's so much involved in this.
Faircop's history/work might also be useful - anyone who has been contacted by the police due to things they've said/written. Anyone who has lost work due to things they've said. Kathleen Stock's recent list on Twitter of academics who've faced problems, too.
In Scotland there's been a fair bit of discussion on freedom of speech - there's hte 'Free to Disagree' campaign, I think that's a church backed group.