Nick Read has always rejected the claims.
The firm says he has its full backing to lead the organisation – which continues to be under scrutiny over the Horizon scandal.
Former investigator Jon Longman was involved in the case of subpostmistress Seema Misra at West Byfleet.
She was jailed in 2010 whilst pregnant, for stealing.
He says he didn’t consider the impact of faulty IT software.
