i found some really interesting material on the ethical issues of supermarkets. it's really good to even just be aware of these issues, if you can't yet change the way you shop. i found this website to be very educational:

• https://www.ethicalconsumer.org/retailers/shopping-guide/supermarkets

for those interested:

• tesco is supposedly the best supermarket for vegan options, as they seem to have the most brands (i can vouch for that, as i have been very happy with the amount of choices tesco supplies).