The Saatchi agencies have been grouped into two networks: Backer Spielvogel Bates and Saatchi & Saatchi Advertising.

But a consultant who has seen presentations from several Saatchi agencies recently said he thought some of the work he had seen "lacked intensity about it."

"We've got to make the numbers work for Scott," has become an oft-repeated phrase at Saatchi agencies.

Saatchi agencies have recently lost some large accounts in the United States, including Brown & Williamson, which said on Wednesday that it would leave Campbell Mitchun Esty.

Toyota will remain, according to an agency source, and an attempt will be made to keep the $120 million A.M.C. account by switching it to the Detroit office of another Saatchi agency.

Among the things he noted were these: * Saatchi agencies now place 20 percent of all television advertising in the United States.

The consolidation, which establishes a single global brand name for the Saatchi agencies that focus on health care, creates the third-largest such international network, with billings of $214 million and income of $27 million.

Over the last several years, the new management dislodged the brothers from luxurious new offices overlooking Berkeley Square and installed them in the dowdier building housing the Saatchi agency.

He said the informal links between Campbell-Mithun and KHBB, a Saatchi agency in London, would probably be strengthened to enable them to work together internationally.

Sir Tim, in response, said the new Saatchi agency "is being financed by Maurice Saatchi personally."