Paul Marshall, representing former sub-postmasters, says problems with third party systems in branches, such as ATMs, have been 'overlooked". It indicates there were issues known to the Post Office with third-party systems within branches - separate to Horizon software. Mr Marshall asserts that postmasters who have had appeals against convictions rejected by the Court of Appeal may have lost because their offences didn't fall within the 'narrow scope' of Horizon issues.