A lone hacker stole a range of personal information from shipbroking giant Clarksons last year having infiltrated its computer system over a seven-month period, the company has revealed.

London-listed Clarksons called the police last November after learning of the cyber attack and has since secured a restraining order in the UK courts against the mystery hacker.

In a statement last night Clarksons detailed the timeline of the attack, a blackmail attempt, its work with forensic investigators and other response measures, alongside information on the type of data stolen.