His suit alleges that Coke managers knew that drinks machines were allowing metal residue to contaminate some products when they were frozen.

BBC: Coke hits back in fraud probe

Suppliers of frozen drinks machines have told Coke there had been a few cases of metal residue in dispensers in recent years, the company said.

BBC: Coke hits back in fraud probe

But Coke has said it has conducted its own tests on the drinks machines and found no metal residue and no evidence of health risks to consumers.

BBC: Coke hits back in fraud probe