Can a person carry a weapon in the UK under the Criminal law?

• Yes, you can carry a gun for self-defence
• No, you can't carry a gun under any circumstances
  Explanation:

  "Carrying a weapon: it is a criminal offence to carry a weapon of any kind, even if it is for self-defence."
• Depending on the circumstances, you can carry a gun
• It is not clear whether you can carry a gun or not