Security has been increased around a farm in Hertfordshire where Genetically Modified wheat is being grown.
Campaigners planning to protest about the potential dangers of the experimental crops are being kept away from the crop at the Rothamsted Research centre.
Anti GM group "Take the Flour Back" is worried about contamination to the surrounding area. Rothamsted Research says the possibility of contamination from pollen blown in the wind is small.
More top news
A man with no recollection of who he is has been found in London, with police appealing for help to identify him.
London Underground has made a new offer to unions to try and avert next week's tube strike. But will it work? Here's what you need to know
The Metropolitan Police has responded to allegations that they refused to enter the water to rescue a teenager who was drowning