Are you expecting me to comb through thousands of cases? Obviously they were arrested for saying legal things, if their arrest doesn't follow a conviction in 90% of cases.

If you're going to claim that people get arrested in the UK for criticising the government, it's reasonable to expect you have an example to hand.

I expect that when you say someone was arrested for speech and it's government overreach (as opposed to a legitimate arrest), you should show us the speech they were arrested for, to back up your claim that it's overreach.