Head of marketing procurement Mark Coulson resigned prior to the investigation. Buyer Martin Simper remains in his position with the firm.

A spokeswoman for Vodafone said the firm was continuing to review its print strategy and in the meantime continues to operate in-house print buying.

The investigation was launched after Vodafone was reported to be implementing a new print buying system developed by The Print Specialists, of which Coulson and Simper were previously directors. See previous story.

Story By Andy Scott