Zenith has consolidated its hold on the £4m Center Parcs business in the UK by successfully adding the planning brief to its existing buying role.
Tracey Stern will continue to be the account director at Zenith. Creative will remain with Bates.
Gerry Boyle, head of communications planning at Zenith, said: "It's a fantastic assignment, and we are thrilled to be given the challenge to contribute more fully to Center Parcs' communication strategy."
Zenith has also launched a new division, Zenith Alliance, which will advise clients on all aspects of sponsorship.
Tim Brady, who joined Zenith from TSMS in March, will be the managing director of the new division.
Zenith Alliance has completed sponsorship negotiations for Mars with ITV's On The Ball, and for United Airlines on Sky Sports News.