4. some of the SI crimes dont have a BI fall back alternative meaning they would receive a full crime punishment like theft has no fall back but a s18 does to a s20
1. Proposal of the Butler Committee and Law Commission- said a max penalty of 1 year for a first offence and rising to 3 years for any later convictions
2. Make it a full defence? since the D was incapable of forming the MR, the legal principle said that the defendant should be let go- meaning that intoxication would result in a complete acquittal for all crimes.