Why are Cadbury's Creme Eggs not sold all year round?

Cadbury's will not sell Creme Eggs all year round as they stop being "special."

Tony Bilborough from Cadbury said the chocolate-making firm had attempted year-long sales 20 years ago but it "didn't work."

He told BBC Radio 5 live's Breakfast: "There's something special about Creme Egg season... We long for it in those long, eggless days of summer and autumn."