The agency won the business for the online credit- checking service after a pitch against undisclosed agencies. The incumbent was Media Campaign Services.
Experian's media spend for CreditExpert last year was £2.5m, according to Nielsen. However, the brand, which launched its first TV ad campaign this month, is expected to raise its spend to £8m this year.
CreditExpert's new TV campaign by The Red Brick Road was launched earlier this month to promote protection against identity fraud.
The ad shows an aristocratic "credit expert" directing viewers to the CreditExpert.co.uk website. Once users sign up, CreditExpert's members receive regular alerts whenever there are significant changes to their report, helping them spot identity fraud.