Post Office chiefs changed Horizon data in branches last year without telling operators, inquiry hears

Executive Tracy Marshall tells inquiry such practice has since stopped saying it absolutely shouldn't have happened'

Post Office executives changed data on the Horizon IT systems used by post office operators without their knowledge as recently as last year, the public inquiry into the scandal has heard.

The inquiry was shown a letter from Calum Greenhow, the chief executive of the National Federation of Subpostmasters (NFSP) and a post office operator for 22 years, to the Post Office raising the issue in May last year.