Disconnecting and capping the supply to the DB is in fact criminal damage if it has been carried out without the owners consent
There exist three offences of criminal damage contained in the Criminal Damage Act 1971. These are simple criminal damage under s.1(1), aggravated criminal damage under s.1(2) and criminal damage by arson under s.1(3). In addition s.2 covers threats to destroy or damage property belonging to another and s.3 covers possession of items with intent to use them or permit others to use them to destroy or damage property belonging to another. The maximum penalty for aggravated criminal damage and arson is life imprisonment. The maximum for all other offences tried on indictment is 10 years. There is a special statutory defence available under s.5 of lawful excuse.
Simple criminal damage s1(1)
S.1(1) Criminal Damage Act 1971 provides that a person is guilty of criminal damage if they intentionally or recklessly destroy or damage property belonging to another without lawful excuse.
Actus reus of simple criminal damage
The actus reus of simple criminal damage consists of:
Destroy or damage
Property
Belonging to another
Destroy or damage
There is no statutory definition of 'destroy or damage', however some principles have emerged from case law:
There is no requirement that the property is rendered useless, a diminution in value is sufficient for liability for criminal damage:
Roper v Knott [1898] 1 QB 868 Case summary
If no damage in fact occurs then no liability for criminal damage can arise:
A (a Juvenile) v R [1978] Crim LR 689 Case summary
However, damage includes temporary impairment or temporary loss of use:
R v Fiak [2005] EWCA Crim 2381 Case summary
Morphitis v Salmon [1990] Crim LR 48 Case summary
R v Whiteley [1991] 93 CAR 25 Case summary
The courts have come close to finding that actual damage is unnecessary:
Samuels v Stubbs [1972] 4 SASR 200 Case summary
Importantly, where expense has been incurred in restoring the property to its former state, this will constitute criminal damage:
Roe v Kingerlee [1986] Crim LR 735 Case summary
This seems to apply even where the expense was unnecessarily incurred:
Hardman v Chief Constable of Avon [1986] Crim LR 330 Case summary
Destroying or damage can be committed by an omission:
R v Miller [1983] 2 AC 161 Case summary
Property
The definition of property for the purposes of criminal damage is found in s.10(1) Criminal Damage Act 1971. Property embraces only tangible property. It includes real property (land and buildings) and personal property. Money is also included. By virtue of s.10(1) (a) animals are only included if they are tamed or ordinarily kept in captivity and under s.10(1)(B) wild mushrooms, fruit, flowers, foliage and plants are excluded.
It may even be percieved as Reckless Criminal Damage:
The appropriate test of recklessness for criminal damage is:
"A person acts recklessly within the meaning of section 1 of the Criminal Damage Act 1971 with respect to -
(i) a circumstance when he is aware of a risk that it exists or will exist;
(ii) a result when he is aware of a risk that it will occur;
and it is, in the circumstances known to him, unreasonable to take the risk."
IMHO from the information i have put above, this clearly outlines what this person has done is in fact criminal damage, as im sure other persons would agree