Percy Pigs are one of the first Brexit casualties, as the sweets struggle to get across the Irish Sea into Ireland's supermarkets.
Marks & Spencer says getting to grips with the new rules is becoming tricky.
One problem for the retailer is that many of its products sold in Ireland are sent to the UK before being shipped out, and so could incur extra tariffs.
Twitter Rowes In On Percy Pig Shortage
Twitter users have taken to the site to express their reaction to the shortage.
One Twitter user called for a revolt, writing "I will not stand for this".
Brexit was a direct attack on Mark’s & Spencer’s stores in Ireland we must revolt! I will not stand for this
— reesh (@KrisJennerTD) January 8, 2021
Another writes that the Brexit referendum would have ended differently if the potential scarcity was known back in 2016.
there's no way Brexit would have won if people had known of the collateral damage to Percy Pigs
— dave ❄️ 🥕 🧻 (@davemacladd) January 8, 2021
While others are just glad they stocked up in the popular confectionary in advance.
they laughed at me when I said Percy Pigs were the best hedge against hyperinflation . now look . the shelves are pigless. it's the weimar republic and all the pigs are in my pen . make me an offer pic.twitter.com/N0pteWjMGS
— fenian history official ® (@spooftaig) January 8, 2021
Marks and Spencer assured customers that they are working to mitigate the factors causing stock shortages.