Self-defence is a legal doctrine which says that a person may use reasonable force in the defence of himself or another. This defence arises both from common law and the Criminal Law Act 1967. Self-defence is a justification rather than an excuse, that is, the defence says that the person's actions were not a crime at all.
Based on the above text, what's the best answer to this question: can self-defence be a defence to affray uk?
yes