Police said the man was arrested on suspicion of conspiracy to cause misconduct in a public office, contrary to Section 1 of the Criminal Law Act 1977.

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Ackroyd was due to stand trial charged with taking part in a string of cyber-attacks, but today pleaded guilty to one charge of carrying out an unauthorised act to impair the operation of a computer, contrary to the Criminal Law Act 1977.

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Alison Levitt QC, principal legal advisor to the director of public prosecutions, said in a statement that Mr Webster was charged with "two offences of conspiring to commit misconduct in public office, contrary to section 1(1) of the Criminal Law Act 1977".

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