She decided to auction the egg in aid of the Cystic Fibrosis Trust after a friend's son died from the disease. Broughton said she imagined the buyer was interested in preserving, rather than eating, the unusual egg.

The item, laid by a Buff Orpington hen - described as the "Scarlett Johansson of the chicken world" - attracted 64 bids on internet auction site eBay.
But the identity of the winner is not yet known. Broughton told the BBC that she had been tempted to cook and eat the egg before being told it was "one-in-a-billion".
She said: "I was literally about to crack it open to make a pancake when a mate saw the photo I put on Facebook and messaged me to say 'Don't do it!'
"Apparently somebody had sold one before for more than 90 pounds so I thought 'Great if I can sell if for that'.  "When it was at 20 pounds I thought 'Who'd pay that for an egg?' and then it went through the roof. It's unbelievable".
Broughton said she would be keeping a close eye on future eggs in the hope of raising "a few more quid" for the charity, the report said.