“the right to a represent oneself does not take precedence over the right to a fair trial”
"That is not the British tradition, which has permitted individuals to represent themselves in both civil and criminal proceedings. The only notable curtailment is to be found insection 34A of the Criminal Justice Act 1988 which forbids a defendant in a criminal trial to cross-examine a child witness personally. Even in that situation, however, a defendant is not obliged to be professionally represented."
"A person will have a defence to a charge of crime if: (a) the commission of the crime was necessary, or reasonably believed to have been necessary [a number of citations are then given], for the purpose of avoiding or preventing death or serious injury to himself or another; (b) that necessity was the sine qua non of the commission of the crime; and (c) the commission of the crime, viewed objectively, was reasonable and proportionate having regard to the evil to be avoided or prevented. It will not avail the defendant that he believed what he did to have been necessary to avoid the evil if, viewed objectively, it was unnecessary, or, though necessary, was disproportionate."