Update: 2 cops on off road motorcycles have entered the field.
People are attending from around the country, including Cambridge (where the other trial is) and from as far as Brighton and Bristol.
Photos will follow.
Setting off to work
The march on its way to the field
In a surprise move, demonstrators start planting non-GM potatoes
Juggling hot potatoes
We put them in the ground...
... and the police dig them up again (but soon give up)