Yes, we do.
Even ideas that most of us find distasteful should be spoken freely. Yes, this means that we can't jail fringe nutcases who bombard the rest of us with speech that is tasteless, racist, homophobic, obscene, dogmatic, or un-patriotic. (But no law requires anyone to be friends with such people, either.)
But occasionally, the fringe loonies are right. Today most people will agree: Women should have the right to vote. The color of your skin shouldn't decide your destiny in life. Slavery did need to end. If valuable ideas like these can't be suppressed by the government, they can spread throughout our society and eventually change things for the better.
And we can criticize our government openly. As an American, I can say that the war in Afghanistan needs to end, the war in Iraq never should have begun, Obamacare is stupid, President Obama is stupid, taxes are too high, my Senator's incompetent...(I don't actually believe all of these things; they're just random examples of criticisms of government.) This is perhaps the most important part of free speech, and according to the article, the UK lacks these protections.
Free speech protections in the UK aren't as good as the US, but I fully realize that it's nowhere near as bad as a lot of places. In many countries, openly criticizing one's rulers like this would lead to jailing, execution or "disappearance" -- not just of the person, but possibly their family and known associates as well, regardless of their guilt or innocence. (I'm speaking of moral guilt. In authoritarian regimes, when a person's arrested, it virtually guarantees they'll be guilty as far as that country's laws are concerned.)