There is no intermediary involved. The media account was reported to be worth £8 million when OMD picked up the business in 2012.
Agencies have received requests for information as part of the statutory review.
Leo Burnett landed the creative account in 2014 after fighting off competition from Grey, Now and Ogilvy & Mather. The incumbent was FCB Inferno, which did not repitch.
This week, the NSPCC launched a campaign called "it’s time" to highlight the "severe shortage" of therapeutic support available for children who have been abused. The charity is urging the government to improve such services.
In September last year, the NSPCC launched the first TV ad following its rebrand around the belief that "every childhood is worth fighting for".
The charity has recently campaigned to change the laws about sexual messaging, which led to new legislation being introduced in March 2015. The "flaw in the law" campaign, planned and executed by OMD, triumphed at last year’s Campaign Media Awards.
The NSPCC and OMD did not respond to Campaign’s request for comment.