Post Office CTO had 'nagging doubts' about Horizon system despite reliability assurances
As 'heat' built from campaigners, tech boss kept telling MPs everything was fine The former CTO of the Post Office had "nagging doubts" about the Horizon system at the center of one of the most far-reaching miscarriages of justice in UK history, yet he continued to sign off statements to MPs attesting to its security and reliability....