To the best of my knowledge, no one has received "life in prison" for speech (or internet postings) for this reason. There have, however, been quite a few high-profile cases of people being arrested and prosecuted for "inciting" comments online, and some have even been convicted and sentenced to prison. To the best of my recollection, the longest sentence has been a little over a year. In some cases, police have been sent to people's homes to "consult" with them about such posting sand suggest that they be deleted.

There is considerable controversy right now in the UK over what many see as a two-tier justice system, in which "hurty words on the internet," particularly when directed against Muslims, are severely punished while (often undocumented) migrants receive light sentences if any) and are rarely deported even if convicted. In terms of free speech protection, protest marches in which pro-Palestinian protestors engage in outright antisemitism (literally "kill the jews") while those criticizing them risk arrest.

Alongside the "two-tier justice" argument, the UK has seen a bit of a sea change in the "gender wars" over the status of transgender people, following a Supreme Court ruling that reinforced the prevalence of sex over gender in certain situations. Previously, people had found themselves in legal trouble for misgendering transgender folk or protesting incarceration of violent transwomen in women's prisons, but with that ruling, this seems to have largely ceased.

Anger over this situation was once largely restricted to Britain's political right wing, but has recently spread rapidly into more moderate segments of British society. Labour Prime Minister Kier Starmer is historically unpopular, seen as a principal driver of these policies (including a very open immigration policy). The next election in the UK could be a real bloodbath for Labour.