The final results of the GM trials for Britain's biggest crop, winter oil seed rape, show that wildlife and the environment would suffer if the crop was grown in the UK.

In response, the Conservatives said the party would not allow GM crops to be grown in Britain unless it could be proved they were safe.

Elliot Morley, the environment minister, said he will wait for advice from the government's advisory committee before making a final decision, but said the trials demonstrated the government's "precautionary approach on GM crops".