"This isn't a decision I've made quickly, but after 14 years the time is now right for me to move on," Worth said.
Meikle and Worth have grown QAS into a multimillion-pound company, which was acquired in October last year by Experian for 拢106m.
David Coupe, managing director of Experian's marketing services division, said that the health of QAS was a credit to Worth's achievements.
"Harry's promotion recognises the strategic role he has played in contributing to QAS's tremendous business growth."
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