7 elements of duress of threats - Lord Bingham
1. Threat relied upon must be to cause death or serious injury
2. Threat must be directed against the defendant, or his immediate family or someone close to him
3. Threat must be so great as to overbear the ordinary powers of human resistance
4. Was the criminal offence directly caused by threat
5. Was there any evasive actions D was expected to take
6. did D voluntarily lay himself open to threats
7. not available to murder/attempted murder