Very Large Eggs

S bought a pack of Sainsburys' Very Large Eggs (free range). Every one in a pack of six was a double yoker.

I bought another pack of six, two of which were double yokers. I had to throw the rest of the pack away as they were passed their date. I was concerned that the hens producing the Very Large Eggs were being injected with something to produce double yokers.

Me and A bought another pack of Very Large Eggs this weekend. It's like when you see a car crash and you have to look. The eggs were obviously genetically modified but...
This pack didn't have any double yokes. Phew. Some of the yokes were a funny shape...