> _would_ have no laws restricting freedom of speech (libel and incitement excepted)
This is optimistic ahistorical nonsense; the UK had a censorship regime until the Lady Chatterly trial. There has been intelligence service related censorship as long as those have existed, as well (see Spycatcher, Zircon). And let's not get into Northern Ireland. Nobody old enough to remember "Gerry Adams has his voice read by an actor" would claim the UK used to be a bastion of pure free speech.