Criminal Justice (Theft and Fraud Offences) Act 2001

Section 9 - Unlawful use of computer
(1) A person who dishonestly, whether within or outside the State, operates or causes to be operated a computer within the State with the intention of making a gain for himself or herself or another, or of causing loss to another, is guilty of an offence.
(2) A person guilty of an offence under this section is liable on conviction on indictment to a fine or imprisonment for a term not exceeding 10 years or both.

Criminal Damages Act 1991

Section 5 – Unauthorised accessing of data
(1) A person who without lawful excuse operates a computer -
(a) within the State with intent to access any data kept either within or outside the State, or:
(b) outside the State with intent to access any data kept within the State, shall, whether or not he accesses any data, be guilty of an offense and shall be liable on summary conviction to a fine not exceeding £500 or imprisonment for a term not exceeding 3 months or both.
(2) Subsection (1) applies whether or not the person intended to access any particular data or any category of data or data kept by any particular person.