So what has caused the price of cocoa and milk to shoot up?
Extreme weather caused by climate change has hit cocoa farmers’ crop yields in Africa, says Ghadafi Razak, an academic at Warwick Business School.
Extreme rainfall in India, Brazil and Thailand in 2023, followed by droughts the following year have meant poor harvests in those countries too, pushing up prices.
The extra costs take time to feed through to customers, says Christian Jaccarini, a senior food analyst at the Energy & Climate Intelligence Unit think tank, which means those extra costs are hitting shop shelves now.
“It takes about 18 months for the impact of a shock to be felt by consumers, so we still have quite a long time with higher prices for chocolate,” he said.
Milk prices have shot up too. Diarmaid Mac Colgáin, founder of the Concept Dairy consultancy blames the rising cost of feed, fuel and fertilisers as well as farmers facing higher wage bills and production costs.
He says some brands have substituted palm oil and shea oil for some of the milk to make up the fat content of their chocolate.