I think i will go and report to the environmental health office! cheers for the advices

hello there, I bought a Rustler's chicken sandwich from a Scotmid outlet today. I was horrified to find mould growth on the chicken when i opened the pack. the useby date for the sandwich is 06 december. do you think i can sue the sandwich company for negligence? (I haven't eaten it yet! I am aware that I will get my money back if i take it back to scotmid but i wanna make a point about health and safety for the consumers). how shud i go about it? is there a consumer court in Edinburgh?? kindly advise