Firstly as it is difficult to portray intent in writing, so I shall attempt to avoid the problems which have plagued other threads and state that this is meant to be helpful, not argumentative, so if my writing style infers confrontation, that is due to my poor writing, rather than my actual intent.
No you can't, and that is the very crux of my point.
. Fighting is illegal, self defence is not. How then can an illegal fight be legal self defence? There is no confusion, or debate. They are different and one cannot be the other.
No you're are not breaking the law, but that is becasue someone trying to hit you is called assault not a fight, and defending yourself form assault is called self defence, not fighting.
Fighting is when you willingly agree to take your argument outside and settle it in a "square go". Self defence is when one or more people involved are unwilling.
It may sound pedantic but it is not, the distinction is important. Talking about "fighting" when what you really mean is self defence gives people the mistaken impression that a) agreeing to take part in street fights or bar brawls is legal self defence and b) that the skills and tactics needed for success in a consensual fight are the same as the skills and tactics needed for success in self defence.
Furthermore is the consideration that in the when people are convicted by the courts when legally defending themselves, it was not because of what they did, but rather what they said. In Dead or Alive: The Definitive Self Protection Handbook, Geoff Thomspon discusses this very issue:-
Many people are convicted not for what they have done but for what they have said. You are judged on your statement as opposed to the incident itself. So, what does this mean in English? Basically you could defend yourself within the law and yet still be convicted and sent to jail because you did not quote the law correctly when giving a statement. Many of my friends have been sent to jail because they did not understand the law.
Telling the Police someone tried to assault you is a very different thing (to them and to the jury) to telling them you got into a fight.