With the deadline for EU countries who wish to ban genetically GM crops drawing near, writes Oliver Tickell, Poland is the latest to register with the European Commission to go GM-free. Now the division of the EU into pro and anti-GM zones may test the single market beyond its limits.

Poland has just registered with the European Commission as an official GM-free zone. This makes it the tenth EU member state to opt out of cultivating genetically modified (GM) crops.

It joins France, Germany, Austria, Italy, Hungary, Greece, Slovenia, Lithuania and Latvia in either filing the necessary papers with the Commission, or announcing their intention to do so.