AMV's successful defence of its two biggest-spending clients, Sainsbury's and BT, plus its RAC and Motorola wins, saw the Omnicom shop hold pole position ahead of JWT and McCann Erickson in the 2005 rankings, compiled by Nielsen Media Research.
Wieden & Kennedy was the fastest-growing agency in the top 30, with billings up by 89 per cent. FCB London was the biggest casualty: its billings fell almost one-third. Rapier was the highest DM agency.
MediaCom made it three years in a row as the UK's largest media buyer despite MindShare's challenge, which took it to second place after its £206 million Unilever win.
Campaign agency performance scores were better than in 2004. Most agencies (24 of the 86 profiled) scored seven out of nine ("good"), whereas in 2004 most received six out of nine ("satisfactory").