alicopter - criss's 'Hilarious' is, I think, to remind you of this
"In the UK, if someone thinks that what you wrote about them is either defamatory or damaging, the onus will be entirely on you to prove that your comments are true in court. In other words, if you make the claim, you've got to prove it."
which is the opposite of what you seem to think. Perhaps you need to read up on 'Libel'?