Defense of lawful excuse

Discuss the following;

1. Offences of criminal damage, aggravated criminal damage, arson, aggravated arson
2. Defence of lawful excuse
3. Issues of trial and punishment applicable to the above offences
   As part of the above, your knowledge and understanding of the following
   legislation and case law will be examinable:
   Criminal Damage Act 1971, ss 1, 4, 5 and 10
   Cox v Riley (1986) 83 Cr App R 54
   Henderson v Battley (1984) 29/11/84 (CA, Criminal Div)
   Morphitis v Salmon [1990] Crim LR 48
   Roe v Kingerlee [1986] Crim LR 735
   Gayford v Chouler [1898] 1 QB 316
   Steer [1988] AC 111
   G [2004] 1 AC 1034
   Smith (David) [1974] QB 354
   Mohan [1976] QB 1
   Woollin [1999] 1 AC 82
   Denton [1981] 1 WLR 1446