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Boots and TK Maxx have issued a warning for shoppers who bought popular television and film-themed enamel mugs. Boots says it has "been informed of a potential safety issue with the mug in this set." Boots said: "It is possible that heavy metals may migrate from the enamel coating into hot drinks, posing a health risk if ingested repeatedly over a long period of time. Therefore, this product is being recalled. "The safety and well-being of our customers is very important to us so we’re asking that you stop using the mug and return it to your nearest Boots store at your earliest convenience for a full refund. READ MORE SUV drivers face new 'premium' to park their cars in part of UK "If you’ve bought this product for someone else, it’s important that you let them know about this as soon as possible." This is affecting: The pharmacy giant said: "We’re sorry for any inconvenience this may cause you. If you do have any concerns or need any further advice, then please contact Blue Sky Designs Ltd on: "Email recall@blueskystudios.co.uk. Telephone 0800 980 3901 (office hours 0900am – 1700 pm)." TK Maxx has recalled four character-themed mugs that were sold in stores between May and September this year. The affected products include designs featuring Harry Potter, South Park, SpongeBob, and Teenage Mutant Ninja Turtles, priced between £6.99 and £10.99. The retailer confirmed that testing revealed the mugs' coating could release heavy metal concentrations exceeding permitted safety thresholds. TK Maxx said: "The vendor is recalling these products because they do not meet safety standards for materials intended to come into contact with food. "Testing has shown that the coating may release levels of heavy metals that exceed safe limits, which could pose a potential health risk if used with food or beverages."