They sent her an e-mail asking her to participate in an on-line survey. I did it, and used it to tell them that we wouldn't be shopping with them again. They have a panel for your comments, but then only allow you 500 characters to do it. So that's "tell us why you don't like us - in less than 500 words".
I sent this:-
I now despise what Tesco stands for, particularly after the Hugh FW and Jamie O series on TV.
I was shocked by your arrogance. Tesco’s comments were offensive compared to your peers. Your market share is driving so much animal cruelty. Tesco should be leading, yet it's quite obvious that you are at best following on this issue, and at worst actually prolonging a bad situation.
My £3000 per year will go to one of your competitors from now on. I hope that many others are also going to do the same.