|The face of veal (sadly I could have used a picture of a calf like this one in a veal crate).|
You could for instance say that you won't shop there whilst they continue to sell that veal and you'll tell other people why.
UPDATE - I received he following Tweet from Tesco on July 5th, 2012
To view this click on the picture.
Note - As of September 24th, 2012 Tesco was still selling veal.