The companies in question include McDonald's, KFC, PepsiCo, Kellogg's, Unilever, Mars and Diageo.
Health secretary Andrew Lansley has set up five "responsibility deal" networks with businesses to come up with policies. Many say this is the equivalent of putting cancer policy in the hands of tobacco companies.
According to The Guardian:
"The groups are dominated by food and alcohol industry members, who have been invited to suggest measures to tackle public health crises ... In early meetings, these commercial partners have been invited to draft priorities and identify barriers, such as EU legislation, that they would like removed."
Sources:

What Does McDonald's, PepsiCo, and Mars Know About Health?
Poor Nutrition Drives Declining Health Statistics
Corruption and Bribes – Business as Usual in the Food Industry
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