R v Aitken

 Some RAF pilots were taking part in horseplay to which V consented. During the horseplay he received serious burns. The judge gave directions on “maliciously” (if the Ds foresaw some harm) but did not direct on what was meant by “unlawful” except that it was beyond horseplay. Ds were convicted of GBH under s.20. CA allowed their appeals on the basis that D did consent and that consent to undisciplined, rough horseplay, such as that which V had been involved in throughout the night, was not itself unlawful.