The review, led by marketing director Paul Fraser, covered the planning and buying for Dairy Crest's entire portfolio of brands, including Cathedral City, Clover, Country Life, Dairy Crest milk and Frijj milkshakes.
A UM spokesman declined to comment on the news.
According to figures from The Nielsen Company, Dairy Crest spent £9.2m on media in the 12 months to 28 February, with TV advertising accounting for £9m and outdoor £800,000.
Country Life has recently courted controversy over its ads starring John Lydon, in which the former Sex Pistol-turned-butter-advocate aimed jibes at rival brand Anchor butter because it is produced in New Zealand.
In the ads he says: "Do I buy Country Life butter because, unlike Anchor from New Zealand, they support our great British dairy farmers?
"Nah, I buy Country Life 'cos I think it tastes the best."
The ads drew accusations of protectionism and underhandedness from The Federated Farmers of New Zealand, which also riposted that British butter is "pale and insipid".
Dairy Crest was established in 1981 as the processing arm of the Milk Marketing Board. It launched Clover - its first mass-market dairy spread - in 1983.
It also owns brands including St Ivel, Vitalite, Wexford Cheese and Utterly Butterly.
The latter recently signed its first TV sponsorship deal, endorsing ITV1's Do The Funniest Things series of programmes.
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