EVER since witnessing â" as a 12-year-old â" the sickening slaughter of calf by a rabbi who slit the animalâs throat and impassively watched it in its death throes, I have sworn off religiously-slaughtered meat, and have gone to great lengths to avoid all kosher and halal produce. So you can imagine my disgust when â" a couple of weeks back â" the BBC Radio 4 consumer affairs programme, You and Yours, reported â" in an overall tone of approval â" that an increasing number of supermarkets in the UK w