Morrisons has become the first of the big four to ensure all its own-label eggs are free-range and British.

The announcement comes nine months ahead of Morrisons' original target and two years before the EU's ban on battery cages comes into force. "Morrisons has achieved great strides over the past 12 months. Its move demonstrates its commitment to animal welfare," said a CIWF spokeswoman.

With Morrisons' new online egg-tracker, shoppers can also trace eggs back to the farm where they were laid.