Just had lunch at a local cafe - I was really hankering for a sandwich but I wanted one without butter as I trying to be dairy free temporarily for a health issue.
Found a chicken and mayo one - I couldn't see any butter through the packaging and when I bought it and opened it up it did indeed have no butter. So I ate it and it was very nice 
I did notice thought that the allergens label stated it did have dairy but mayo is made with eggs, not milk so isn't this a mis-labelling? It couldn't have been in the bread as there was a vegan salad sandwich on the same bread that was labelled as without dairy. It could only have been referring to the mayo.
Wibu to tell them this was wrong, for future reference? Or will I come across as a prize twat?