more seriously, the practices of kosher and halal are all but the same owing to the historical need to ensure freshness of meat in a summer 30 degree+ climate - just like so many other practices re meat and fish prep as well as handling dead humans and all the rest......so if Tesco are practising halal they are de facto going kosher too - and given their Hebrew origins one can appreciate that.
If you object to these observations, then, as many have suggested, buy local, go veggie, or just fall in an open pit grave with hot coals it..........Or you coould take the issue up with Archbishop Rowan Williams whom, I am sure, would love some reason to digress from all his bishes leaving to join the German Pope.