64.—(1) Paragraph (2) applies where in accordance with a provision mentioned in paragraph (3) it is a defence for a person charged with an offence to prove or show a particular matter.
(2) If the person adduces evidence which is sufficient to raise an issue with respect to the matter the court or jury shall assume that the defence is satisfied unless the prosecution proves beyond reasonable doubt that it is not.
(3) The provisions in respect of which paragraph (2) applies are articles 39(2), 42(3), 43(3) and 51(5).