People across the UK are being warned not to eat mustard if they have a peanut allergy after fears mustard supplies have been contaminated. The Food Standards Agency has warned anyone with a peanut allergy to avoid any mustard containing product, including sandwiches, pre packed sandwiches, wraps, dips, sauces and salads. Such mustard products could contain traces of peanut, potentially causing severe reactions for those with an allergy.

The FSA is working to establish the source of the contamination. A spokesman said: “We have traced the contaminated mustard ingredients to a producer in India called GT Agro Industries and have identified one company who has supplied these ingredients for use in UK food. The UK company affected, FGS Ingredients Ltd, has advised customers to remove from sale products containing the contaminated mustard ingredients.

There is no evidence other suppliers are affected so far, the agency added. If mustard is present in a food, it should be labelled in bold on the packet because it is an allergen itself,” the FSA advised. “If there is a risk that mustard could be unintentionally present in food there will be a ‘may contain’ label for mustard.

“If you are eating out, please ask the cafe or restaurant staff if any of their products contain mustard – by law, food businesses must provide this information to customers.” FSA’s director of food policy, Rebecca Sudworth, said: “Those with a peanut allergy should avoid consuming products .