Actresses Susan Sarandon and Daryl Hannah have signed a campaign letter warning Brits of the dangers of genetically modified (Gm) food imported from the U.S.

The open letter, which warns of the damage of non-organic meals, was delivered to British Prime Minister David Cameron's official residence at Downing Street in London on Wednesday (12Nov14) by campaigners including fashion mogul Dame Vivienne Westwood.

Almost 60 million people have signed the missive to counter the pro-Gm plan that has been raised by the British Government to open the U.K. up to Gm crops and food.

The European Commission and the U.S Government are in talks regarding a free trade agreement which would increase the flow of American Gm food into Britain and Europe.

Americans who have signed the letter are hoping to show British people how damaging the produce can be to both their health and the environment.

Sarandon says in a statement, "Instead of bringing certainty and security, GmOs (Genetically Modified Organisms) have raised more and more worrying questions about their effectiveness, their necessity, and even their safety. Polls show that the majority of U.S. citizens - and in fact citizens everywhere - either want them labelled or taken out of the food system altogether."

Westwood adds, "GmOs are a democratic issue. They are a massive, unethical experiment in human and environmental health."

The designer previously threatened to derail the anti-Gm campaign when she came under fire for suggesting people should eat less if they cannot afford to eat organic food. Westwood later clarified her remarks, explaining, "My comments were related to eating less meat. People are eating far too much factory-farmed meat and junk food which is bad for you and not providing the nutrients you need. You can source good food and organic farmed meat for less."