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Jaffa cakes have become the latest chocolate treat to be downsized, sparking outrage from fans across the country.

McVitie’s has reduced the number of Jaffa cakes in a standard pack from 12 to 10, but some stores are continuing to sell them for the same price.

The new pack contains 122g instead of 146.4g, with the recommended retail price lowered from £1.15 to 99p. This means the cost per biscuit has increased from 9.58p to 9.8p.

However, some stores have been found selling the smaller packs for the same price as their predecessors.

Ocado is currently offering the 10-packs for £1.19, which works out at 11.9p per biscuit.

Other shops recently sold the bigger packs for £1 and are offering the new ones at the same price, the Sun reported.

A McVitie’s spokesperson confirmed there had been no changes to the actual biscuit, and said retailers were responsible for their own prices.

But fans of the popular biscuit took to Twitter to lament the latest saga in a series of downsizings including Toblerone, Maltesers and Walnut Whips.

Kien Tan wrote: “What's worse than Uber, Trump & Brexit? @McVities cuts no of #jaffacakes in pack to 10. Have We Not Suffered Enough?”

Rob Moore added: “It takes a lot to outrage me, but just read that @McVities have skunk a packet of Jaffa Cakes from 12 to 10 for same price!”

Another person tweeted: “Woke up to the terrible news today that @McVities have reduced the number of Jaffa cakes from 12 to 10. This is an abomination.”

One Twitter user added: “Jaffa cakes are now in packs of 10 rather than 12. Don’t you think this world is cruel enough already, McVities??”

The McVitie’s spokesperson said: “We have taken the decision to adjust the pack size of our McVitie's Jaffa Cakes products.

“There is no change in the size, shape or weight of individual cakes in the McVitie's Jaffa Cake range.

“Pricing ultimately remains at the sole discretion of retailers.”