Sean has violated the bank's computer policy and there are three likely consequences for his actions. First, if the bank deems Sean's actions severe enough it can terminate his employment and deny his benefits? Second, the bank can bring a lawsuit against Sean based on the English Tort Law: Causation [Barnett v chelsea & Kensington Hospital  1 QB 428 and Chester v Afshar  3 WLR 927]. This is in anticipation that the bank's customers become aware of Sean's actions and take their business elsewhere. This would cause an economic loss concerning customer revenue. The more people that know about the situation the more money will be lost by the bank. Third, the bank can have Sean arrested for his violation of bank computer policy which has already occured.
In terms of the police Sean can be charged with a cybercrime offense which is covered by both the Computer Misue Act 1990 and the Police and Justice Act 2006. Sean can be sentenced to 2 years in prison.
The Computer Misuse Act 1990, ‘an Act to make provision for securing computer material against unauthorised access or modification; and for connected purposes’, set out three computer misuse offences.
Unauthorised access to computer material
Unauthorised access with intent to commit or facilitate commission of further offences
Unauthorised modification of computer material
The maximum prison sentences specified by the act for each offence were six months, five years and five years respectively (Amendments to the Computer Misuse Act, introduced in the Police and Justice Act 2006, are discussed below).
The Police and Justice Act 2006 [PDF 748Кb] (which covers broader issues than computer crime alone) included amendments to the Computer Misuse Act. The maximum prison sentence under section 1 of the original Act was increased from six months to two years. Section 3 of the Act (‘unauthorised modification of computer material’) was amended to read ‘unauthorised acts with intent to impair or with recklessness as to impairing, operation of computer, etc.’ and carries a maximum sentence of ten years.
The Act also added another section, ‘Making, supplying or obtaining articles for use in computer misuse offences’, carrying a maximum sentence of two years. This section states:
A person is guilty of an offence if he makes, adapts, supplies or offers to supply any article intending it to be used to commit, or to assist in the commission of, an offence under section 1 or 3.
A person is guilty of an offence if he supplies or offers to supply any article believing that it is likely to be used to commit, or to assist in the commission of, an offence under section 1 or 3.
A person is guilty of an offence if he obtains any article with a view to its being supplied for use to commit, or to assist in the commission of, an offence under section 1 or 3.
In this section “article” includes any program or data held in electronic form.