Tesco isn't the only retailer i've been boycotting over the last three or four years.  When I bought some dates from Julian Graves during one of their promotional offers I didn't expect an 'Added Bonus' which came in the form of a one and a half inch rusty wire nail in the middle of one of them on which I almost broke a tooth.  After the initial shock I started to think about the consequences if I had swallowed it, or perhaps even worse if a young child had got it instead of me!  Of course, I contacted the local Trading Standards office who took up the responsibility of contacting Julian Graves for an initial explanation.  After a week or so Trading Standards got back to me sayimg they had received a probable explanation plus an apology about which we got together to discuss.  After talking with Trading Standards they asked me if I wished them to follow up with a prosecution.  I thought that as long as they were aware and did all the things they promised Trading Standards as a reputable company to ensure it didn't happen again, then pressing for court action would be a bit OTT so I said I wouldn't demand it.  Trading Standards wrote to Julian Graves telling them of my decision copying the letter to me with a suggestion that i would recieve a full apology from the company plus some suitable recompense.  After four weeks I heard nothing!  i sent a letter and another four weeks - nothing!  Another letter and I still haven't heard from them to this day!!  I've never even received a refund for the packet of dates!  The rest of which went straight in the bin!!
So - another retailer that myself, my family or my friends won't go near!