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Computer Misuse Act 1990

S.1 (1) A person is guilty of an offence if-
a) he cause a computer to perform any function with intent to secure access to any program or data held in any computer
b) the access he intends to secure is unauthorised and
c) he knows at that time when he causes the computer to perform the function that that is the case.

n.b. The intent does not have to direct at any particular program or data, a particular kind of program or data, or a program or data held in any particular computer.

S.2 (1) A person is guilty of an offence if he commits a section 1 offence with intent –
a) to commit an offence or
b) to facilitate the commission of an offence by himself or any other person.

S.3 (1) A person is guilty of an offence if –
a) he modifies the contents of any computer without authorisation, and
b) at the time he has requisite intent and requisite knowledge.
n.b. Requisite intent and knowledge defined in S.3 (2) and S.3(3).