[BreShiE]

God the amount of off-topic-posting in this thread is ridiculous.

This is a rather good method, however it's not strictly restricted to Tesco. Also, this will only work for the stores own-make products as they will tell you to refer to the company of complaint. I know this as I found a lump in a can of Dr. Pepper once bought from Tesco, and they sent it off to Dr. Peppers' lab and told me to get in contact with them.