The Horizon accounting system, designed and installed by Fujitsu Services, came into operation in 1999. Former sub-postmasters claimed to have experienced problems with the Post Office's Horizon accounting system since 2009, with funds reported missing.

Paolo Sidoli said: "Significant public interest will be generated by this high profile and costly group action claim, which the Post Office has confirmed would be 'material' to its business in the event of an adverse outcome.

The proceedings will be carefully case-managed by the Court, given the complexity of the legal issues and the quantities of financial, expert and accounting evidence with which it will be presented by the parties in the coming weeks.

The legal issues will include whether the allegedly faulty computer system caused the financial and personal losses being claimed and the extent to which the claims are time-barred under the Limitation Act. Other companies who deploy similarly complex computer systems dealing with high volume transactions will doubtless be keeping a careful eye on the effectiveness of their own systems, as will their insurers."

Post Office faces court battle over accounting software is available to read on Accountancy Daily website. 

Paolo is a partner in the litigation and professional discipline team. He has a broad range of corporate and commercial litigation experience and has had the conduct of a number of high profile disputes in the High Court and through the ADR processes of arbitration, expert determination and mediation.