Non fatal offences - GBH s.20
"Unlawfully and maliciously wound or inflict GBH on another"
Wound - break or cut in the continuity of 7 layers in the skin - JCC Eisenhower
GBH = really serious harm - DPP V Smith
MR - intention or recklessness to cause some harm.
Non fatal offences - S.18
"Unlawfully and maliciously wounding or infilicting GBH on another person"
MR: Intention to cause GBH
Intention to resist arrest but reckless as to whether GBH is caused - Morrison