In a statement Weetabix have confirmed that they have had to halt production of two cereals due to the impact of last year's bad weather on the wheat crops.
Two men were arrested on suspicion of public order offences during today's demonstration. Hertfordshire Police said:
Protestors have advanced towards the police line.
They are nowsitting in front of the police.
Around 150 people have gathered in Hertfordshire toprotest against trials of GM wheat crops.
For more on this story, see ITV Anglia.
Protestors planning action over a genetically modified wheat trial in Hertfordshire have been banned from going anywhere near the crop.
A group called Take The Flour Back had planned a day of protests at Rothamsted Research in Harpenden.
But St Albans council has won an order from the Home Office to use extra police powers to stop them going on to the land, amid fears the demonstration could result in damage to crops and buildings.
Supporters are due to congregate in Rothamsted Park, next to the institute, at noon.
The plan was to proceed along footpaths to a site where scientists are growing a new strain of experimental wheat.
Take The Flour Back hopes "hundreds" of activists will answer the rallying call.
For more on this story visit the ITV Anglia website.
A video created by the 'Take the Flour' back campaign explains what the group's members will protest against this afternoon:
The video claims:
"There has been no proper safety research for GM wheat. GM food can have unintended results. Plus, releasing anti-biotic anything into the wild is a bad idea."