I telephoned Aldi customer services, explained the situation and asked them if they could let my local store know so that they could check the other items from the shelves. They suggested that I take the box of food back and request a refund. The food was cheap so I am not interested in a refund but I was concerned about others having uninvited guests in their kitchen. So I sent a pm to Aldi using Twitter again asking them to contact my local store so that they could check other items, and they replied saying, destroy the food and take their response to my local store and I will be given a refund. Missing the point again.
Once I had dumped the box outside and disinfected my kitchen table I felt a bit less icky about it. I may put some gardening gloves on tomorrow and empty the sachets into my wildlife patch for the hedgehogs.