Ok heres something.
While I am certainly not suggesting you have elaborated in any way, when it boils down to it, we as readers have only your word on it and we as readers do not actually know who you are at all. While I fully commend your efforts in writing the email and sending it to the appropriate people and to be honest see no reason at all why I would disbelieve you or defend the business in question.
My problem is this. At this point in time, everything you have written is an unsubstantiated claim and in my opinion complaints like this via the internet should for legal reasons be kept nameless, by all means if people pm you wanted to know the shop in question then you should tell them. But you could get yourself and the owners of this forum into rather a lot of trouble if the shop in question this time (or usually pets@home) were to find out someone was writing such damaging claims about them.
I personally feel that yes you may want to warn people but as we have just seen, at least two people have just stated that they will be taking their business elsewhere purely based on what you have said, I imagine BAS would be extremely upset about that and would no doubt be interested in taking action against you, which they legally would be well within their rights to.
Now please, if everyone could read this post properly. Do not mistake me for defending this shop or indeed agreeing with the contents of the topic in anyway.
My issue is with the type of topic we have here and not anything to do with the people in question either way.